On my life, all the way from Chicago boss man lol. You need your own company or podcast that goes national, because I was screwed over on my sounds, but I cleaned up nicely after watching your videos. Mad respect ✊🏾
Out of all the youtubers doing audio equipment, your videos have definitely been the most helpful. Especially in showing that you don't need a fancy $300 SMD DD-1 to properly set the gain or other parameters.
I totally agree. Do you need one for personal use? No. I do it for a living and it comes in super handy. You don't need a mobile detailing trailer to wash your personal car but if you do it for a living, a bucket, rags and dish soap won't cut it😉
All your videos are great and this one in particular has been extremely helpful as I’ve struggled to setup the crossovers on my four channel amp. Spent 30 mins this morning setting the gain and crossovers and my car sounds fantastic. Thank you, sir. Subscribed :)
You are definatley one of my favorite audio CZcamsrs. Great info. Great contribution not only to the diy guys but the industry as a whole. Keep up the great work bro
Old but gold, today I just finish tweaked x-over regarding to your guidance. 12db/oct by amp & 6db/oct (Butterworth) by HU at same spot 100Hz. No need to switch polarity in sub cause 180degree phase (3rd order). My system now mixed micracle. Thank you!
one of the best, if not the best, crossover setting videos out there. thank you! if you felt like it & had the interest, .... you can record voltages over a frequency band/range and adjust the crossover to max/min and test the amplifiers crossover slope. then you can graph results and see if the crossover slope is as claimed! :)
I like to think so! I have been doing some research on different crossover alignments and if I ever get them all figured out I will make an even better video!
I've always dependes on the 2 object on the side of my head. Called ears if it don't sound nice and clear something's amiss. Kind of like timing my trucks engine you can hear a miss . Nothing fancy just ears. Great video I also keep my volt meter in my pocket it's am everyday everything tool.
My amp manual tells me to do this by ear using a 75% volume set point which for me is impossible and entirely guess work. I look forward to use your multimeter method. Thank you very much.
Well this is a nice video on crossovers that I’ll definitely be using in the future. Normally I don’t need exact crossover settings, but this’ll come in handy for my highpass that needs to be set at 17 or 18Hz 2nd order. And I’ll want that to be almost perfectly set because I’d rather not bottom out my lil Ultimax under 18Hz. Wish I had DSP in the car because in the house my Inuke DSP makes it so simple just type in the number and select the slope and done. (Though it doesn’t let you DSP below 20Hz sadly)
Your 1st dude I seen set x-over settings with a multimeter, very informative. Can the same process be done on a external 4way x-over made by zapco or prv or whoever
@@DIYAudioGuy the manual on my JBL subwoofer amp says something like "turn the frequency down until you can't hear any mids and highs." really appreciate the video!
thanks bro....save me confusion. i didnt know the knob of the screw to set the htz mids to highs even tho knob set on the number dont mean its the number...wow....amps are sometimes hard to figure out at times
Love your videos. I cannot find any info on my 4ch amp for the hpf cut off slope. Should I assume that is a -12db slope before I do my calculations. Cheers
I like the way you explain everything. I don't have a DSP, so I was looking at using the crossover on my amp. How do we find A:the db/octave slope that our amp uses? And B: the "unfiltered voltage"? Should we just leave the crossover off, and see what voltage we get out of the speaker terminals, and use that?
I have the SKAR audio RP-150.4AB for my mids and highs and And Hifonics Zeus ZRX2400.1D for my sub. Bought my sub and amp years and years ago, and am now trying to do a proper setup in my car.
Unfiltered voltage is just that, it's the voltage without any filters on. It does not really matter what the starting voltage is. I recommend turning the head unit up until you get 10 volts just to make the math easier. Your owner's manual should tell you what your crossover slopes are and the type of crossover.
Thanks mate really knowledgeable One thing I have got amplifier but no gain knobs only bass eq , LPF,HPF, Levels,crossover and subsonic So don’t no how to set the gain for subwoofer please
Bonjour je voulais vous poser une question comme le réglage du crossover modifie la tension je devrais régler le crossover avant le gain ? Merci pour votre retour
I like the video and details but I must have missed the one that explains how you choose which frequency you are targeting? For instance how do you know how high of hz to set your subwoofers frequency? 80, 100, 120. What frequency range your mids can play, and what frequency is the lowest frequency your tweeters can handle ?
You set crossovers at full power. Can you also do this work at any given voltage? say 1v output so you can do it with speakers hooked up. doesnt the speakers impedance affect the voltage output of the amp?
What I do now is I pick a lower voltage, and something that makes the math easy. So I'll adjust the head unit until I get something like 10 volts. There are some who suggest you should do these settings with the speakers connected I disagree because you run the risk of damaging your speakers by pumping test tones through them. Plus test zones are hell on your ears.
I have a skar RP 1200.1D. The specs says it’s a 24 dB/OCT. It also had a subsonic filter that goes from off to 50hz. The LPF goes from 50 hz to 220. I have the LPF at its highest like you said l. Whenever i multiply the unfiltered voltage by .251, the number i get is too low. No matter how low I go on the LPF, I can’t get the multimeter to that number i calculated. Could that be a result of a cheap multimeter? Or what could it be?
Ty it was always such a pain to guess where 80hz on the crossover is. I never understood why they have like 30hz and like 150hz on a crossover and no other marks.
Hi do you have a different site for more detailed correspondence? I’m starting a project but have quickly realized I may be in over my head a bit but I want to learn so I want to do it myself. You might be able to help with some more detailed question answers.
@@DIYAudioGuy Greetings! To follow up on your reply. In my case, it was not possible to set the gain first. I had to do the LPF and HPF (subsonic) tunings. Reason I couldn't do my gain first was because I could not reach my "required" 31.6V for the 1000W for my sub. The minimum reading on the DMM was 32.0+ V on the absolute lowest gain setting. Only after once I set the crossover points on the LPF and HPF first, did my gain gain knob actually give sensible voltage values. Does this seem correct to you? Does it actually make a difference which you tune first? Thank you! edit: my sub level on the headunit was to 0.
@@DIYAudioGuy First I set the subsonic filter by playing a 30Hz 0dB tone. Then I set the LPF by playing a 80Hz 0dB tone. Finally I adjusted the amplifier's gain knob (headunit was 85% of max volume) by playing a 40Hz -3dB tone to bring it to the ~31.6V. Anything that jumps at you that you would do differently? Thanks!
Sorry for my poor english but I have an question for you. I followed this video tutorial yesterday when I tweaked an 4x80w 4 ohm´s amplifier (GAS 80,4 Pro) with a crossover. The strange things where that the output voltage did not change at all when I switshed between HPF and Full range. I could see a minor difference when I screwed the wheel but it was way under 1 volt. I had an unfiltered voltage of around 10,05v and it was almost the same when I swithed to HPF. If I connected the speakers I could hear the difference in sound so it seemed that the filter worked correctly. I suppose I did something wrong, I also tried to use an oscilloscope on the speaker outputs both on the 4x80w 4ohm amplifier (1000hz -5db test tone) and the 1000w GAS 1.1000 PRO 1-4 ohm (40hz -5db testtone) to get the correct gain but the curves on the ocilloscope looked distorded way under the max output that those amplifier should have left. For example the 1000w amplifier had a clean signal only up to 17v. The head unit where correctly tweaked with the oscilloscope and the volume where set to that maximum level. In the end I just put the voltage at 17,8v at the 80.4 amplifier and 34.6v (600w 2ohm) at the 1.1000 amplifier and it sounds just fine in my opinion but it was really annoying that I could'nt do it the way that i had planned from the beginning. The HPF screw where just put around where I thought 80hz where.
I have a taramps bass 15 it has a high pass and low pass filter, because it's a amp for subs do I turn the high pass filter all the way up to block out higher frequencies? Basically how do I set these 2 controls to keep the pure sound of bass?
I'm going to take a screenshot of this and answer it on our live stream tonight because there are a ton of people with questions about that specific thing. You can tune in or you can watch the replay.
Can I use the same principles for home audio? Let's say building a crossover, which I'm trying to avoid, but I'm using a couple crown xls 1000'swhich have the adjustable high pass,low pass built in ?
I really appreciate your videos, I'm not sure what I am doing wrong, but I have a 1200.1d amp, 24/oct variable amp, 32hz tuned ported box. Does it matter if I set LPF or SS first? I tried both, but am unable to get the HPF down to 2.51, It will only go to 5 dropped to the lowest. 24 hz tone for SS and 80 for HPF. Thank you for your videos.
It's really hard to say without being there to troubleshoot the amp. But you probably should be okay, a 24 DB slope is very steep so you can get away with setting it as slightly higher frequency. Main thing is to take it easy with the volume knob until you're certain that you're not unloading a little frequencies.
So, if I want an 80hz crossover frequency then if I take my unfiltered voltage and do the math then I will be down by x amount of DBs at that crossover frequency. So should I play a test tone that is one octave below my crossover point so that I will be at 0db until that point? (oops, meant below not above ... or wait, did I mean below????)
Question, does the bass knob at all affect the voltage setting in any way while setting crossovers. I know you said turn the volume you enough to get a read out.
czcams.com/video/4kDxUcGCe8M/video.htmlsi=mq7uMEWpYDC6p1mg The idea here is to use the DMM to look for a 3 or 6 db drop. When you run that through the db formula the starting point does not matter. Down 3 db from 10 volts and down 3 db from 20 volts is still down 3 db.
Yes, it does. What I've started to do lately is to set the volume so that the voltage is at a nice round number to make the math easy. If the starting voltage is 10 then all you have to do is move the decimal in order to do the math.
I have a NVX JAD1200 and its a 24octave amp. I put my volume at 28 and played a 75hz tone. I put the crossover the highest it could go and I got a reading of 31.5v. I multiplied the unfiltered voltage to 0.251 and it's 8.85. I lowered the level on the crossover and did not lower more than 20v. So I lowered the volume and Got it to 8.0v (by luck) I Tried getting to 8.8v but the next notch jumps to 9.5.
That's a solid amp, I have the 4-channel version. I wish they still sold the JAD line, I am not fond of the newer VAD line. I am sure they are good amps, I just don't like the look. I have been doing a lot of research on crossovers and have had some good feedback from viewers, here is what I have learned: There are different crossover types (bessel, buttworth, linkwitz-riley), they are all implemented differently, and not every company implements them as intended. I think for that amp your best bet is to set the crossover using .708 (the -3 db down point). Most importantly, set it so that it sounds the best. The technical stuff is fun, but the music is what matters. I hope to get some updated crossover videos out when it warms up!
@@DIYAudioGuy I love this amp, it fits under my passenger seat and it swallows lots of juice and the power sounds clean. I'm also using their 2ohm VCW 12" Sub in a vented enclosure at 32hz.. That's interesting I did not know that there's different crossover types. I'm also using the Audio Control LC2i LoC and it sends about 9v pre amp out put. Can that affect the reading on the multi meter? .. At the end I put the crossover on the amp one notch over because it sounded better.
@@kevinc6073 The voltage from the LC2i will not impact the crossover setting, but it will impact the gain, with that much input voltage you can keep the gain low. You will have less noise in the system.
@@DIYAudioGuy I used your other video to help guide me to set my gain. I had a feeling it would impact my gain setting because my subwoofer is pretty loud and it is a 1/4" Turn before the half gain mark on the amp. I might even have to turn it down one more notch. Wanted to give the woofer exactly 1000rms
Maybe i missed something but if your unfiltered voltage is 50v and you are driving a 1ohm load. At 80hz 24db/oct slope your target voltage is 25volts. You have to apply the 0.251 to the wattage ( @1ohm load. 50v x 50v = 2500watts ; 2500 x 0.251 = 625watts ; square root of 625w = 25v. Take it or leave it guys . Not trying to argue with anyone. DIY guy you are still awesome.
I have a Skar audio 1500.1D mono running 2 12’ kickers L7q at 0.5 ohz im still trying to figure out the amp settings please help i want it to hit. Fyi running a stock radio
It is difficult to trouble shoot over the internet. I have several videos on setting up an amp. Have you seen this one? czcams.com/video/oBNETr9AHwA/video.html
Wanting to get a voltage reading of your crossover for the technicality is cool (awesome job on showing us!), but is it really necessary? I find that crossovers have to change according to what you're listening to. At my home entertainment system, when I'm watching a movie, I set my crossover on my subwoofer to about 80 htz so that the dialogue doesn't come through. When I'm listening to music, I set it to about 120-180 htz (depending on the type of music) so that I can hear the upper-ish mid frequencies of the bass guitar and not just the kick and floor tom. It's set all by ear. No multi-meter required. Don't beat yourself up guys if you can't get this math right. Lower your crossover to cut off the frequencies you do not wish to hear through your sub (that's what it's designed to do). If it sounds muddy, cut some more out. If you want more beef/punch, raise it up some. Again, don't worry about the numbers. Hear it.
new to your channel, a newbie question. if my head unit come with crossover function for the front speaker, can I set my 4 channels Kicker amp to "Full"? Moreover my front speakers also came with a pair of passive crossover! is it good enough for preventing blowing my system? thanks
Yes. I prefer the crossover on the head unit since it is easer to set -- no multimeter needed. I would need to know more about your passive crossover to give you a complete answer, there are several ways that those can be configured. If you are running a two -way component set then crossover will protect the tweeter and the crossover on the head unit will keep the low bass out of the midrange driver.
Great video DIY Audio Guy. i watch a lot of videos i'm still cunfused to set crossover sittings how i can know the slope or OCT for my amp? i dont found any information from anywhere
The crossover slope should be in the manual, if you can't find a manual online, I can't help you much. You can just assume that it's a 12 DB per octave slope and go with it.
lets say i played a 38hz test tone and adjusted the subsonic filter, then to set the lpf should i take the original unfiltered voltage i used for the subsonic and do the calculation or the “new” voltage and redo the calculation but with a 80hz for the lpf?
You'll need something more advanced than a multimeter to know for sure. The 75% rule of thumb is just a rule of thumb, it works for most people and will get them close enough. Without more measuring and testing the only thing you can do is turn it up until it sounds bad then turn it back down a notch.
Hi DIY Audio Guy, I've learned so much from the few videos I've watch. Love learning the math portion of this. I am bit confused see i have a dm-810 dsp, do I match the slope of amp on my dsp so they are the same. Do I set the crossover on both the dsp and amp or just one of them? Thanks for taking the time and doing these videos.
@@DIYAudioGuy awesome i was using both crossovers on dsp and amp. Thank you for sharing your knowledge. I look forward to watching more of your videos.
@@DIYAudioGuy one last thing if my amp is 12db, should my dsp be set to 12db to match the amp or could I set it to what I want I have 12db and 24db on dsp.
Either is fine. Set it so it sounds good and blends well with the rest of the system. The key advantage to the steeper slope is it gives you more flexibility when matching up drivers. You can for example cross a tweeter over a little bit closer to its resonant frequency when you jump up to a 24 DB per octave slope. An aluminum cone mid-range is going to have some really nasty cone break up at the upper end of the frequency, a 24 DB crossover slope makes it a lot easier to filter that out. If you don't trust your ear then you will need to find a friend with a golden ear to help you tune it or see about getting your hands on an RTA. You can build a cheap one with a smartphone and a few parts that you probably have lying around. czcams.com/video/7orJovlXvBM/video.html
Do you use the same test tone as you used for gain setting? Like if you used a -5db 1000hz for gain setting a 4 channel, do you use a -5 db tone at specific hz to set crossover?
If you are setting the crossover at 80 hz use an 80hz tone, if you are setting the crossover at 1500 hz use a 1500 hz tone. The volume of the test tone does not matter. I tinker with the volume on the head unit so that I start with 10 volts, that way the math is super easy.
Hello , awesome video , just having a brain fart , when I set my gains on my sub amp , the LP filter should be at its lowest setting , then when I set the crossover turn to highest setting , get my target voltage around 10v multiply by my amps 12db slope at .501 then turn down until I get 5.01 volts correct?
Think of the crossover as a choke (some people even use that term for an inductor in a passive crossover) on a carburetor it limits the airflow into the engine. Step one is to turn off the choke or open it up as much as possible. For a low pass filter the lowest setting is full choke, nothing gets through. For a high pass filter the highest setting is full choke, nothing gets threw. You want to open it up. Set the gain and leave it open. Then use the instructions in this video to set the crossover to your exact desired position.
I am setting up the Alpine mono 500w amp (31.62V) you have in your gain setup vid (..My sub can rated to 200w so I juices it to 240w, so thats 22v. I assume when you start the LPF your still playing to same 40/50 htz test tone at 75% vol. The Alpine amp is 24db Octave and therefore the voltage should be 5.59v. Does that sound correct
Say im using a DSP, do i need to set the crossovers on the amps too? If not, do i just set the switch on a 4ch to Full Range? And for the HPF/LPF knobs, where do i set them If they don't go to zero (both for sub and mids/high amps)
No need for the crossovers on the amplifiers if you're doing it all with the DSP. Yes, If the crossover has an off switch, go ahead and turn them off. If you don't have an off switch, then set your low pass filters to the highest frequency, most of the time. This means turning it all the way to the right. Then set the high pass crossover to the lowest possible frequency, typically this means turning them all the way to the left.
I am a little confused. on the spreadsheet you used 20volts as the unfiltered voltage and that 20 was used for the formulas in the calculations but then show 13v as the starting voltage. What is the difference between the 20v and the 13v? Is there as filter that is on that filters the 20 to 13? I am assuming there is. Thanks again.
The starting voltage is going to depend on where you have the volume set. What I have been doing lately is I have been turning the head unit up until I got 10 volts. That makes the math a whole lot easier.
So when I go to set my lpf my read output voltage is 50 volts. So I go to play an 80hz test tone and start turning from left to right my lpf to roughly 25 volts as I have a 12b/octave slope on my lpf and the lpf bottoms out at 36 volts?? What shall I do now!Help plz DIY Audio Guy
I understand the video at the different crossover points. My problem is that I’m at 19.8 of unfiltered voltage at 80 hertz. When I do the math it comes to be 4.96 volts. When I adjust my low pass filter my voltage is rising not lowering.
My amp has no shut offs and my high pass and low pass are both always on…. Gus’s I just have to use a processor to but how do I set these ?!?. Not sure how to do it with both active at the same time.
It does not really matter. But It is best practice to set your gains properly before you set the crossovers. I always like tinker with the volume on the radio until I get a good round number for the first reading. This just makes the math easier. These videos may help: czcams.com/video/MBcGOoRJ4Ro/video.html czcams.com/video/iWRoIho7A7c/video.html
If I'm using the crossover in the DSP I just set the AMP x-over to FULL and start in on setting the signal gain and don't have to do any of this, correct? Didn't you make a video on setting the amp signal gains accurately with a DMM? Can you link that here as well? Thanks.
I don't have a chart, but you can just hit pause at about the 1:00 mark and take a screen shot. Here is the formula that I used to calculate them: 10^(-(slope)/2)/20)
Seems informative, but I must have missed how to calculate the voltage factor, or is that standard related to the slope. I like knowing where and why…I’m not the “because that’s what they said” guy. Great videos by the way.
I don't show the calculations in the video, I just show the results in the video. The formula used for the calculation can be found here: czcams.com/video/4kDxUcGCe8M/video.html
On my pdx-1.1000 alphine amp the db/oct slope shows as a negative numbers and not a positive like this -> (-24dB/oct) would I use the positive 24 voltage factor ?
Nice dog 🐕 Had a question I wanted to ask you, What’s your take on this?, why wouldn’t every amplifier that comes with a crossover adjustment, not give you the option to have it adjustable down to 0. For example, the infrasonic filter on most bass amplifiers in today’s market are adjustable from say 20-50hz or 15hz-35hz. This doesn’t allow someone the opportunity to not use the filter, because even at its lowest point, it is still cutting the voltage. What I hear from most people is that you shouldn’t notice that much of a decrease in loudness in those range of frequencies from having it at 15hz as compared to an amp that doesn’t have one, but I beg to differ. Some of these amps nowadays have 24 dB slope on the Filter, and that really does affect a 20hz tone even having the filter it at its lowest point of 15hz. Sorry for the long winded comment and question. Keep up the great content!
OK, here is what I think! Let's say you set the subsonic filter to 20 HZ, and it is a 6DB per octave linkwitz riley, it will be down 3DB at 20 HZ. Then down 6DB at 15 HZ and down 12DB at 7.5 HZ. Down 3DB at 20HZ is not much at all, but it is kind of a moot point since most subs are going to roll off before they get down to 25 HZ. Setting the subsonic to 15 HZ is practically the same as setting at at zero. But this is just my best educated guess.
@@DIYAudioGuy i appreciate the response. In my experience, 99% of amps that have the subsonic filter on the amp, is either 12db per octave or 24. i think rockford had one amp that had 18db per octave but was a one off idea. 6 db down at 20 hz is definetly noticable to me, especially when listening to full orchestra performances i have on cd's or watching movies in my car, like at a family camp trip when i show off lol. But i see your point, subs would roll off some by that point and most music that is Mastered correctly with "real" music doesnt dip below 25hz. Just thought id pick your brain on the subject. Thanks again, have a good one!
But what if you Want more bass from your HPF filters? I just use an O-scope and set my input volume (phone) and headunit to max with my equalizer settings preferred and adjust both gain and hpf until I'm in no clipping territory and have achieved as low of hz as I want. I don't know howto do it more detailed and down to the science despite watching a lot of videos and reading.
@@DIYAudioGuy I really appreciate the response DIY Audio Guy. Really appreciate the content too. You are one of the guys I've been liking following closely on CZcams. Thank you for all the work your doing on us newer guys behalf and putting it out here for us! 💛
Hi thanks for all your videos, really helps a lot. I have a question, where are you getting your starting voltage from (could it be where the head unit and amp are set at the moment) and do you set this before setting the subsonic filter? Thanks
@@tonydize3944 I don't have any experience with that brand, so I can't say for sure. My best guess is that it's a bass boost and the - 12 is off. If you tried searching online for an owner's manual?
@@DIYAudioGuy thank you again friend you're always replying to your followers i see all the comments I watch your videos every day just to learn more in fact i was watching them right now keep up the great work you do 👏🏻
Sounds like you're trying to cross over a tweeter. Most amplifiers are not designed to do that. Some will have a 10x switch on them that will multiply the crossover by 10. Look for an amplifier that has that. All of the JP series 4 channel amplifiers have the 10x switch. Hit the down for sound link in the video description.
How do you set a gain and xover for tweeter @125rms and xover @6000hz? I can do this for 150hz, 50hz, etc but the multimeter isn’t reading the way i expected.
Interesting, what is the multimeter doing? Most multimeters can read the frequency, try a 6,000 hz test tone and see if the multimeter can read the frequency.
Two questions. 1- If I set my low pass on my sub to 120HZ, then my 4 sets of components on the 4 channels high pass to 120Hz do I run the risk of canceling out in certain areas where the speakers won’t play sound? 2- if I want my rear 6x9s to act as my mid range and play a full/band pass so I can play between 120hz-500Hz how would I do this if setting the voltage for channels 3/4 would require tuning the same channel for proper cut off on the other end?
1) Yes, a 2nd order Linkwitz-Riley crossover will have a null at the crossover point. It is easy to fix just flip the polarity on the sub. If it sound better then keep it that way, if not then flip it back. 2) Set the voltage the same, you just need a bandpass crossover.
@@DIYAudioGuy ok so that's generally for subwoofer, correct? And what frequency should I play for full range speakers? These are probably dumb questions but I'm fairly new to all this.
Hang on, I Just give you a terrible answer. Ithought you were asking a question on a different video. If you're trying to set the high pass on an amplifier for some coaxials or a set of components then you would also use 80 hertz. 80 hertz is kind of a standard starting point for crossovers.
Enjoying your videos! Sorry if I have multiple questions on different videos, but what do you mean unfiltered voltage? Is this with a tone playing? Volume set to highest without clipping?
Unfiltered, as in the crossover is not on, or not doing anything. it is with the tone playing with the volume does not have to be set to maximum. You just need enough volume so that you can read a voltage on the multimeter. Keep the questions coming. I'm sure there are others with the exact same question that would like an answer. If people are asking questions it means that I need to make another video on the topic.
You don't need the volume all the way up when setting crossovers. It's just a matter of comparing the voltage before and after. I show how to check for clipping in this video: czcams.com/video/L0ZXq2eo-OM/video.html
The way you set crossover seems to be different from others. On other videos, people will play the frequency that they want their crossover set at, and whatever the voltage is when the frequency is playing, they will adjust the knob until voltage starts to drop and that’s where we would set it at.
Take a look at what happens around 11:20. I turned the crossover on and I turned the knob all the way to the right. So the crossover is set to 500 Hertz. At that point the voltage is just slightly less than the starting voltage. So if you use the other method your crossover would be set to 500 hz, not 50. Those other videos have thousands of views. Which means there are thousands of people out there with crossovers that are off by an order of magnitude. You will notice that in this video I verified my math by comparing my predicted results against the result I got from the digital signal processor.
The crossover frequency point is always -3dB. So setting to crossover to 80hz means that there will be a -3b or 30% reduction in voltage at 80hz. This video shows exactly that
Crossovers can get pretty complicated. I'm not 100% sure that I have it right. But I've seen some CZcams videos, from larger channels that should know better, that absolutely have it wrong. Not trying to cast shade on them, just trying to help people.
Most amps have fixed slopes. The setting up for a target crossover, at an assumed frequency where the amp labelling is, could be inaccurate. If say one rotates the knob to a 90 hz lowpass, the only sure way to know IT has kicked in at the right frequency, is to start Sweeps and record the voltage where it changes. Burst tones are more accurate, at increments of one. There are audiophile test cds with these tones. The track number and test tone at certain frequency is given.
@@DIYAudioGuy the voltage factors are as shown? So for future reference if I were to do the math. A 6db per octave slope will always have a voltage factor of 0.708?
Play a test tone equal to the frequency of the crossover point you wish to set. So if you want to set your crossover at 80 hertz play in 80 hertz test tone.
If I'm saying this correctly. The subsonic is to keep your sub from dropping below its lowest frequency response. Say your sub has a frequency response from 28hz-300hz. You would put the subsonic at 30hz so it cant drop below 28hz and damage your sub. The amp gain or voltage doesn't factor what your subsonic setting is. I think your box tune does tho. If your box is turned at 32hz if your sub plays lower than 32hz it can damage your speaker. So you would want a subsonic at 32hz or slightly higher.
The rule of thumb is that you should set your subsonic filter one half an octave below your tuning frequency. So if your tuning frequency is 32 hz multiply that by 0.75 and you should get 24 hz.
I am little confused. In every article and video they have asked to multiply by 0.707 irrespective of slope. Isn't the meaning of cut off frequency is that it is 3db down from 0 db or. 707 of original value whatever the slope may be?
@@Dilpalsingh I've noticed the same thing. But as you can see in the video my math matches the digital signal processors output. I'm open to the idea that I might be mistaken, but if I am then this DSP is doing it wrong. I figured all the math out before I took the measurements.
as someone who has only recently gotten into car audio, your videos have been extremely helpful and its a sin you arent more popular. Props!
I appreciate that. CZcams is a slow grind my channel will be big one day, it just takes time.
On my life, all the way from Chicago boss man lol. You need your own company or podcast that goes national, because I was screwed over on my sounds, but I cleaned up nicely after watching your videos. Mad respect ✊🏾
Out of all the youtubers doing audio equipment, your videos have definitely been the most helpful. Especially in showing that you don't need a fancy $300 SMD DD-1 to properly set the gain or other parameters.
Those are great tools and I would love to have one. But you can't really justify spending that much unless you are doing it for a living.
I totally agree. Do you need one for personal use? No. I do it for a living and it comes in super handy. You don't need a mobile detailing trailer to wash your personal car but if you do it for a living, a bucket, rags and dish soap won't cut it😉
All your videos are great and this one in particular has been extremely helpful as I’ve struggled to setup the crossovers on my four channel amp. Spent 30 mins this morning setting the gain and crossovers and my car sounds fantastic. Thank you, sir. Subscribed :)
Awesome! I'm glad I was able to help.
Im so glad i found this video again. Recently got a new set up and its in need of some tuning. Thanks for your help!
Glad to help.
Your videos are Awesome! Thank you for simplified but correct ways to get where we're going!!
Thanks!
You are definatley one of my favorite audio CZcamsrs. Great info. Great contribution not only to the diy guys but the industry as a whole. Keep up the great work bro
I'm just a normal guy with a camera and some power tools! If I can do this stuff anybody can.
@@DIYAudioGuy do I put one lead on positive and one on negative speaker terminal?
This is the correct way to do it proved with the DSP. Great Vid!
Either that or my DSP does it wrong. 😆😆😆
Old but gold, today I just finish tweaked x-over regarding to your guidance. 12db/oct by amp & 6db/oct (Butterworth) by HU at same spot 100Hz. No need to switch polarity in sub cause 180degree phase (3rd order). My system now mixed micracle. Thank you!
Nice work!
one of the best, if not the best, crossover setting videos out there. thank you! if you felt like it & had the interest, .... you can record voltages over a frequency band/range and adjust the crossover to max/min and test the amplifiers crossover slope. then you can graph results and see if the crossover slope is as claimed! :)
Just what i needed!! Thank you
Glad I could help!
Pro tip, double tap the recent app button to toggle your last used app... Great crossover info! Thank you.
Cool, thanks!
Saved me $180 .. Subscribed! Thanks!!
Glad I could help!
best crossover video on you tube!!!
I like to think so! I have been doing some research on different crossover alignments and if I ever get them all figured out I will make an even better video!
Gentleman you have a new subscriber
Welcome to the adventure!
Love the videos
Thanks!
I've always dependes on the 2 object on the side of my head. Called ears if it don't sound nice and clear something's amiss. Kind of like timing my trucks engine you can hear a miss . Nothing fancy just ears. Great video I also keep my volt meter in my pocket it's am everyday everything tool.
My amp manual tells me to do this by ear using a 75% volume set point which for me is impossible and entirely guess work. I look forward to use your multimeter method. Thank you very much.
You can spend a little bit more and get an oscilloscope and be even more accurate. czcams.com/video/oBNETr9AHwA/video.html
Awesome video
Thanks!
Well this is a nice video on crossovers that I’ll definitely be using in the future.
Normally I don’t need exact crossover settings, but this’ll come in handy for my highpass that needs to be set at 17 or 18Hz 2nd order. And I’ll want that to be almost perfectly set because I’d rather not bottom out my lil Ultimax under 18Hz.
Wish I had DSP in the car because in the house my Inuke DSP makes it so simple just type in the number and select the slope and done. (Though it doesn’t let you DSP below 20Hz sadly)
What size Ultimax?
@@DIYAudioGuy It's the 10" that I've mentioned in another comment on another video of yours. (The one I've planned with 3 10 inch passive radiators)
How do you choose what test tone for what you want
Your 1st dude I seen set x-over settings with a multimeter, very informative. Can the same process be done on a external 4way x-over made by zapco or prv or whoever
Yes!
this is way better than what the amplifier manuals tell you to do
Interesting, I have never read the manual. At least not the part on setting the crossover.
@@DIYAudioGuy the manual on my JBL subwoofer amp says something like "turn the frequency down until you can't hear any mids and highs." really appreciate the video!
thanks bro....save me confusion. i didnt know the knob of the screw to set the htz mids to highs even tho knob set on the number dont mean its the number...wow....amps are sometimes hard to figure out at times
Love your videos. I cannot find any info on my 4ch amp for the hpf cut off slope. Should I assume that is a -12db slope before I do my calculations. Cheers
Yes, that would be a safe bet.
I like the way you explain everything. I don't have a DSP, so I was looking at using the crossover on my amp. How do we find A:the db/octave slope that our amp uses?
And B: the "unfiltered voltage"? Should we just leave the crossover off, and see what voltage we get out of the speaker terminals, and use that?
I have the SKAR audio RP-150.4AB for my mids and highs and
And Hifonics Zeus ZRX2400.1D for my sub. Bought my sub and amp years and years ago, and am now trying to do a proper setup in my car.
Unfiltered voltage is just that, it's the voltage without any filters on. It does not really matter what the starting voltage is. I recommend turning the head unit up until you get 10 volts just to make the math easier.
Your owner's manual should tell you what your crossover slopes are and the type of crossover.
Thanks
Thanks mate really knowledgeable
One thing I have got amplifier but no gain knobs only bass eq , LPF,HPF, Levels,crossover and subsonic
So don’t no how to set the gain for subwoofer please
The levels might be your gain knobs.
Bonjour je voulais vous poser une question comme le réglage du crossover modifie la tension je devrais régler le crossover avant le gain ? Merci pour votre retour
I like the video and details but I must have missed the one that explains how you choose which frequency you are targeting?
For instance how do you know how high of hz to set your subwoofers frequency? 80, 100, 120. What frequency range your mids can play, and what frequency is the lowest frequency your tweeters can handle ?
I did not cover that in this video. I don't think I have a video that talks about that specifically.
how fo i set my lpf on a monoblock? im trying to set it to somewhere between 60-80hz
You set crossovers at full power. Can you also do this work at any given voltage? say 1v output so you can do it with speakers hooked up. doesnt the speakers impedance affect the voltage output of the amp?
What I do now is I pick a lower voltage, and something that makes the math easy. So I'll adjust the head unit until I get something like 10 volts. There are some who suggest you should do these settings with the speakers connected I disagree because you run the risk of damaging your speakers by pumping test tones through them. Plus test zones are hell on your ears.
I have a skar RP 1200.1D. The specs says it’s a 24 dB/OCT. It also had a subsonic filter that goes from off to 50hz. The LPF goes from 50 hz to 220. I have the LPF at its highest like you said l. Whenever i multiply the unfiltered voltage by .251, the number i get is too low. No matter how low I go on the LPF, I can’t get the multimeter to that number i calculated. Could that be a result of a cheap multimeter? Or what could it be?
Ty it was always such a pain to guess where 80hz on the crossover is. I never understood why they have like 30hz and like 150hz on a crossover and no other marks.
Glad I could help. Don't forget the most important thing. How does it sound? The math is just there to get you close. Let your ears do the rest.
Hi do you have a different site for more detailed correspondence? I’m starting a project but have quickly realized I may be in over my head a bit but I want to learn so I want to do it myself. You might be able to help with some more detailed question answers.
You can email me DIYaudioguy@gmail.com.
Great video very informative.. I have a question. do u do this crossover settings after setting your gain with a 40 or 50 hertz tone?
Yes, set the gain first.
@@DIYAudioGuy Greetings! To follow up on your reply. In my case, it was not possible to set the gain first. I had to do the LPF and HPF (subsonic) tunings. Reason I couldn't do my gain first was because I could not reach my "required" 31.6V for the 1000W for my sub. The minimum reading on the DMM was 32.0+ V on the absolute lowest gain setting. Only after once I set the crossover points on the LPF and HPF first, did my gain gain knob actually give sensible voltage values. Does this seem correct to you? Does it actually make a difference which you tune first? Thank you!
edit: my sub level on the headunit was to 0.
Sounds like it worked out fine for you. What frequency test tone did you use to set the gain and what is your crossover frequency?
@@DIYAudioGuy First I set the subsonic filter by playing a 30Hz 0dB tone. Then I set the LPF by playing a 80Hz 0dB tone. Finally I adjusted the amplifier's gain knob (headunit was 85% of max volume) by playing a 40Hz -3dB tone to bring it to the ~31.6V. Anything that jumps at you that you would do differently? Thanks!
@@acmilanshevachels If you are happy with the sound and you are not clipping, then it is good.
Sorry for my poor english but I have an question for you. I followed this video tutorial yesterday when I tweaked an 4x80w 4 ohm´s amplifier (GAS 80,4 Pro) with a crossover. The strange things where that the output voltage did not change at all when I switshed between HPF and Full range. I could see a minor difference when I screwed the wheel but it was way under 1 volt. I had an unfiltered voltage of around 10,05v and it was almost the same when I swithed to HPF. If I connected the speakers I could hear the difference in sound so it seemed that the filter worked correctly. I suppose I did something wrong,
I also tried to use an oscilloscope on the speaker outputs both on the 4x80w 4ohm amplifier (1000hz -5db test tone) and the 1000w GAS 1.1000 PRO 1-4 ohm (40hz -5db testtone) to get the correct gain but the curves on the ocilloscope looked distorded way under the max output that those amplifier should have left. For example the 1000w amplifier had a clean signal only up to 17v. The head unit where correctly tweaked with the oscilloscope and the volume where set to that maximum level.
In the end I just put the voltage at 17,8v at the 80.4 amplifier and 34.6v (600w 2ohm) at the 1.1000 amplifier and it sounds just fine in my opinion but it was really annoying that I could'nt do it the way that i had planned from the beginning. The HPF screw where just put around where I thought 80hz where.
I am sorry it did not work. It is very difficult to trouble-shoot in CZcams comments. If it sounds good to you then it should be fine.
Glad i found you, but i only have one question. How did you come up with the voltage factor?
It's based on the DB formula that I explained in this video czcams.com/video/4kDxUcGCe8M/video.html
@@DIYAudioGuy Thank you sir.
I have a taramps bass 15 it has a high pass and low pass filter, because it's a amp for subs do I turn the high pass filter all the way up to block out higher frequencies? Basically how do I set these 2 controls to keep the pure sound of bass?
I'm going to take a screenshot of this and answer it on our live stream tonight because there are a ton of people with questions about that specific thing. You can tune in or you can watch the replay.
Can I use the same principles for home audio? Let's say building a crossover, which I'm trying to avoid, but I'm using a couple crown xls 1000'swhich have the adjustable high pass,low pass built in ?
Yes.
And also would I set my gain to to the appropriate level with the low pass and subsonic open before I set the low pad and subsonic filter
When you set the gains you want all of your crossovers off and any EQ settings set to zero or flat.
I really appreciate your videos, I'm not sure what I am doing wrong, but I have a 1200.1d amp, 24/oct variable amp, 32hz tuned ported box. Does it matter if I set LPF or SS first? I tried both, but am unable to get the HPF down to 2.51, It will only go to 5 dropped to the lowest. 24 hz tone for SS and 80 for HPF. Thank you for your videos.
It's really hard to say without being there to troubleshoot the amp. But you probably should be okay, a 24 DB slope is very steep so you can get away with setting it as slightly higher frequency.
Main thing is to take it easy with the volume knob until you're certain that you're not unloading a little frequencies.
So, if I want an 80hz crossover frequency then if I take my unfiltered voltage and do the math then I will be down by x amount of DBs at that crossover frequency. So should I play a test tone that is one octave below my crossover point so that I will be at 0db until that point? (oops, meant below not above ... or wait, did I mean below????)
Question, does the bass knob at all affect the voltage setting in any way while setting crossovers. I know you said turn the volume you enough to get a read out.
czcams.com/video/4kDxUcGCe8M/video.htmlsi=mq7uMEWpYDC6p1mg The idea here is to use the DMM to look for a 3 or 6 db drop. When you run that through the db formula the starting point does not matter. Down 3 db from 10 volts and down 3 db from 20 volts is still down 3 db.
Does this formula work at any volume level? I assume the reference voltage is the voltage at whatever volume you are at.
Yes, it does. What I've started to do lately is to set the volume so that the voltage is at a nice round number to make the math easy. If the starting voltage is 10 then all you have to do is move the decimal in order to do the math.
I have a NVX JAD1200 and its a 24octave amp. I put my volume at 28 and played a 75hz tone. I put the crossover the highest it could go and I got a reading of 31.5v. I multiplied the unfiltered voltage to 0.251 and it's 8.85. I lowered the level on the crossover and did not lower more than 20v. So I lowered the volume and Got it to 8.0v (by luck) I Tried getting to 8.8v but the next notch jumps to 9.5.
That's a solid amp, I have the 4-channel version. I wish they still sold the JAD line, I am not fond of the newer VAD line. I am sure they are good amps, I just don't like the look.
I have been doing a lot of research on crossovers and have had some good feedback from viewers, here is what I have learned: There are different crossover types (bessel, buttworth, linkwitz-riley), they are all implemented differently, and not every company implements them as intended. I think for that amp your best bet is to set the crossover using .708 (the -3 db down point).
Most importantly, set it so that it sounds the best. The technical stuff is fun, but the music is what matters.
I hope to get some updated crossover videos out when it warms up!
@@DIYAudioGuy I love this amp, it fits under my passenger seat and it swallows lots of juice and the power sounds clean. I'm also using their 2ohm VCW 12" Sub in a vented enclosure at 32hz.. That's interesting I did not know that there's different crossover types.
I'm also using the Audio Control LC2i LoC and it sends about 9v pre amp out put. Can that affect the reading on the multi meter? .. At the end I put the crossover on the amp one notch over because it sounded better.
@@kevinc6073 The voltage from the LC2i will not impact the crossover setting, but it will impact the gain, with that much input voltage you can keep the gain low. You will have less noise in the system.
@@DIYAudioGuy I used your other video to help guide me to set my gain. I had a feeling it would impact my gain setting because my subwoofer is pretty loud and it is a 1/4" Turn before the half gain mark on the amp. I might even have to turn it down one more notch. Wanted to give the woofer exactly 1000rms
Maybe i missed something but if your unfiltered voltage is 50v and you are driving a 1ohm load. At 80hz 24db/oct slope your target voltage is 25volts. You have to apply the 0.251 to the wattage ( @1ohm load. 50v x 50v = 2500watts ; 2500 x 0.251 = 625watts ; square root of 625w = 25v. Take it or leave it guys . Not trying to argue with anyone. DIY guy you are still awesome.
Crossovers are not based on watts, they are based on DB. You have to convert from DB to volts to find the crossover point.
I have a Skar audio 1500.1D mono running 2 12’ kickers L7q at 0.5 ohz im still trying to figure out the amp settings please help i want it to hit. Fyi running a stock radio
It is difficult to trouble shoot over the internet. I have several videos on setting up an amp. Have you seen this one? czcams.com/video/oBNETr9AHwA/video.html
Wanting to get a voltage reading of your crossover for the technicality is cool (awesome job on showing us!), but is it really necessary? I find that crossovers have to change according to what you're listening to. At my home entertainment system, when I'm watching a movie, I set my crossover on my subwoofer to about 80 htz so that the dialogue doesn't come through. When I'm listening to music, I set it to about 120-180 htz (depending on the type of music) so that I can hear the upper-ish mid frequencies of the bass guitar and not just the kick and floor tom. It's set all by ear. No multi-meter required. Don't beat yourself up guys if you can't get this math right. Lower your crossover to cut off the frequencies you do not wish to hear through your sub (that's what it's designed to do). If it sounds muddy, cut some more out. If you want more beef/punch, raise it up some. Again, don't worry about the numbers. Hear it.
I don't disagree. The ear is the best test instrument.
new to your channel, a newbie question. if my head unit come with crossover function for the front speaker, can I set my 4 channels Kicker amp to "Full"? Moreover my front speakers also came with a pair of passive crossover! is it good enough for preventing blowing my system? thanks
Yes. I prefer the crossover on the head unit since it is easer to set -- no multimeter needed. I would need to know more about your passive crossover to give you a complete answer, there are several ways that those can be configured. If you are running a two -way component set then crossover will protect the tweeter and the crossover on the head unit will keep the low bass out of the midrange driver.
Great video DIY Audio Guy. i watch a lot of videos i'm still cunfused to set crossover sittings how i can know the slope or OCT for my amp? i dont found any information from anywhere
The crossover slope should be in the manual, if you can't find a manual online, I can't help you much. You can just assume that it's a 12 DB per octave slope and go with it.
@@DIYAudioGuy i send you a message in instagram please check
@@mohavved I'm not seeing your message in Instagram. Feel free to ask your question here, I'll try my best to answer it
@@DIYAudioGuy i send you some pic for my amp to help my username is @9.3
lets say i played a 38hz test tone and adjusted the subsonic filter, then to set the lpf should i take the original unfiltered voltage i used for the subsonic and do the calculation or the “new” voltage and redo the calculation but with a 80hz for the lpf?
That is a great question, join us on our next live show and we will try to give a detailed answer: bit.ly/3PYKG5P
Can I apply this same method and math to set my subsonic filter at 30hz?
Yes! czcams.com/video/iWRoIho7A7c/video.html
What level does the volume need to be at if I already know where I'm clipping?
You'll need something more advanced than a multimeter to know for sure. The 75% rule of thumb is just a rule of thumb, it works for most people and will get them close enough. Without more measuring and testing the only thing you can do is turn it up until it sounds bad then turn it back down a notch.
Hi DIY Audio Guy, I've learned so much from the few videos I've watch. Love learning the math portion of this.
I am bit confused see i have a dm-810 dsp, do I match the slope of amp on my dsp so they are the same. Do I set the crossover on both the dsp and amp or just one of them? Thanks for taking the time and doing these videos.
If you have a DSP you can just turn off the crossovers on the amp and use the DSP.
@@DIYAudioGuy awesome i was using both crossovers on dsp and amp. Thank you for sharing your knowledge. I look forward to watching more of your videos.
@@DIYAudioGuy one last thing if my amp is 12db, should my dsp be set to 12db to match the amp or could I set it to what I want I have 12db and 24db on dsp.
Either is fine. Set it so it sounds good and blends well with the rest of the system.
The key advantage to the steeper slope is it gives you more flexibility when matching up drivers. You can for example cross a tweeter over a little bit closer to its resonant frequency when you jump up to a 24 DB per octave slope. An aluminum cone mid-range is going to have some really nasty cone break up at the upper end of the frequency, a 24 DB crossover slope makes it a lot easier to filter that out.
If you don't trust your ear then you will need to find a friend with a golden ear to help you tune it or see about getting your hands on an RTA. You can build a cheap one with a smartphone and a few parts that you probably have lying around. czcams.com/video/7orJovlXvBM/video.html
@@DIYAudioGuy yes 24 db slopes help avoid crossover phase issues too❤
Do you use the same test tone as you used for gain setting? Like if you used a -5db 1000hz for gain setting a 4 channel, do you use a -5 db tone at specific hz to set crossover?
If you are setting the crossover at 80 hz use an 80hz tone, if you are setting the crossover at 1500 hz use a 1500 hz tone. The volume of the test tone does not matter. I tinker with the volume on the head unit so that I start with 10 volts, that way the math is super easy.
Hello , awesome video , just having a brain fart , when I set my gains on my sub amp , the LP filter should be at its lowest setting , then when I set the crossover turn to highest setting , get my target voltage around 10v multiply by my amps 12db slope at .501 then turn down until I get 5.01 volts correct?
Think of the crossover as a choke (some people even use that term for an inductor in a passive crossover) on a carburetor it limits the airflow into the engine.
Step one is to turn off the choke or open it up as much as possible. For a low pass filter the lowest setting is full choke, nothing gets through. For a high pass filter the highest setting is full choke, nothing gets threw. You want to open it up. Set the gain and leave it open. Then use the instructions in this video to set the crossover to your exact desired position.
@@DIYAudioGuy awesome thank you very much !
I am setting up the Alpine mono 500w amp (31.62V) you have in your gain setup vid (..My sub can rated to 200w so I juices it to 240w, so thats 22v. I assume when you start the LPF your still playing to same 40/50 htz test tone at 75% vol. The Alpine amp is 24db Octave and therefore the voltage should be 5.59v. Does that sound correct
You want to play a tone that equals your desired crossover frequency. czcams.com/video/bNauOkzdTRM/video.html
Question: Does turning up volume make the voltage go up? Not sure what level to play the test tone?
Yes. I like to turn the volume up till I get about 10 volts. That makes the math really easy.
Say im using a DSP, do i need to set the crossovers on the amps too? If not, do i just set the switch on a 4ch to Full Range? And for the HPF/LPF knobs, where do i set them If they don't go to zero (both for sub and mids/high amps)
No need for the crossovers on the amplifiers if you're doing it all with the DSP. Yes, If the crossover has an off switch, go ahead and turn them off.
If you don't have an off switch, then set your low pass filters to the highest frequency, most of the time. This means turning it all the way to the right. Then set the high pass crossover to the lowest possible frequency, typically this means turning them all the way to the left.
How or what is the starting voltage? i just wane make sure.
Any voltage will do. I recommend but you pick one to make the math easy, like say 10 volts.
I am a little confused. on the spreadsheet you used 20volts as the unfiltered voltage and that 20 was used for the formulas in the calculations but then show 13v as the starting voltage. What is the difference between the 20v and the 13v? Is there as filter that is on that filters the 20 to 13? I am assuming there is. Thanks again.
The starting voltage is going to depend on where you have the volume set. What I have been doing lately is I have been turning the head unit up until I got 10 volts. That makes the math a whole lot easier.
may i know what song is it? (00:35) pls and thanx
what if the slope is variable as is in the case of skar 800.1d
Then pick the slope you want to use and do roughly the same thing.
So when I go to set my lpf my read output voltage is 50 volts. So I go to play an 80hz test tone and start turning from left to right my lpf to roughly 25 volts as I have a 12b/octave slope on my lpf and the lpf bottoms out at 36 volts?? What shall I do now!Help plz DIY Audio Guy
That's odd, not sure what to tell you. It is hard to trouble shoot without having the equipment in front of me.
Great Video. I noticed that this math seems to apply to a 12db crossover amp. How would these numbers change if the amp has a 24db built in crossover?
czcams.com/video/KUvJNhC-BAE/video.html
I understand the video at the different crossover points. My problem is that I’m at 19.8 of unfiltered voltage at 80 hertz. When I do the math it comes to be 4.96 volts. When I adjust my low pass filter my voltage is rising not lowering.
@@josephbassil4171 What happened when you turned it the other way?
I cannot turn it the other way I’m just turning it to the right. The gain it on point. 31.68 1000 watts at 1ohm Skar audio amp.
Is there a high pass/low pass switch or an off/on switch?
Does this same trick work on high pass filter? Or low pass only?
Yes.
How would you do this if using the head units lpf?
Most head units will let you choose the frequency. So just pick the one you want to go with.
My amp has no shut offs and my high pass and low pass are both always on…. Gus’s I just have to use a processor to but how do I set these ?!?. Not sure how to do it with both active at the same time.
Start with the low pass on it's highest setting and the high-pass on it's lowest setting.
what value level should be set at when doing this ?
It does not really matter. But It is best practice to set your gains properly before you set the crossovers. I always like tinker with the volume on the radio until I get a good round number for the first reading. This just makes the math easier.
These videos may help:
czcams.com/video/MBcGOoRJ4Ro/video.html
czcams.com/video/iWRoIho7A7c/video.html
Would I set my gain first and then do the crossover after?
Yes
If I'm using the crossover in the DSP I just set the AMP x-over to FULL and start in on setting the signal gain and don't have to do any of this, correct? Didn't you make a video on setting the amp signal gains accurately with a DMM? Can you link that here as well? Thanks.
Correct, and Yes. czcams.com/video/MBcGOoRJ4Ro/video.html
Where can I find the Q multipliers? Is there a chart 📉 or something available?
I don't have a chart, but you can just hit pause at about the 1:00 mark and take a screen shot. Here is the formula that I used to calculate them: 10^(-(slope)/2)/20)
Seems informative, but I must have missed how to calculate the voltage factor, or is that standard related to the slope. I like knowing where and why…I’m not the “because that’s what they said” guy. Great videos by the way.
I used the formula for DBv czcams.com/video/4kDxUcGCe8M/video.htmlsi=3XMWroosrXic56Iz
How do I calculate voltage factor for my amps? I may have missed this step in video
I don't show the calculations in the video, I just show the results in the video. The formula used for the calculation can be found here: czcams.com/video/4kDxUcGCe8M/video.html
@@DIYAudioGuy thank you il give it a go
On my pdx-1.1000 alphine amp the db/oct slope shows as a negative numbers and not a positive like this -> (-24dB/oct) would I use the positive 24 voltage factor ?
Yes, the negative sign just indicates that it's cutting by 24 DB per octave.
@@DIYAudioGuy Thank youuu for always getting back with my questions , I really appreciate it 👍🏽
Nice dog 🐕
Had a question I wanted to ask you, What’s your take on this?, why wouldn’t every amplifier that comes with a crossover adjustment, not give you the option to have it adjustable down to 0. For example, the infrasonic filter on most bass amplifiers in today’s market are adjustable from say 20-50hz or 15hz-35hz. This doesn’t allow someone the opportunity to not use the filter, because even at its lowest point, it is still cutting the voltage. What I hear from most people is that you shouldn’t notice that much of a decrease in loudness in those range of frequencies from having it at 15hz as compared to an amp that doesn’t have one, but I beg to differ. Some of these amps nowadays have 24 dB slope on the Filter, and that really does affect a 20hz tone even having the filter it at its lowest point of 15hz. Sorry for the long winded comment and question. Keep up the great content!
Now that you mention it, that seems kind of odd. when I get to my computer I will try to type up a thoughtful response for you.
OK, here is what I think! Let's say you set the subsonic filter to 20 HZ, and it is a 6DB per octave linkwitz riley, it will be down 3DB at 20 HZ. Then down 6DB at 15 HZ and down 12DB at 7.5 HZ. Down 3DB at 20HZ is not much at all, but it is kind of a moot point since most subs are going to roll off before they get down to 25 HZ. Setting the subsonic to 15 HZ is practically the same as setting at at zero. But this is just my best educated guess.
@@DIYAudioGuy i appreciate the response. In my experience, 99% of amps that have the subsonic filter on the amp, is either 12db per octave or 24. i think rockford had one amp that had 18db per octave but was a one off idea. 6 db down at 20 hz is definetly noticable to me, especially when listening to full orchestra performances i have on cd's or watching movies in my car, like at a family camp trip when i show off lol. But i see your point, subs would roll off some by that point and most music that is Mastered correctly with "real" music doesnt dip below 25hz. Just thought id pick your brain on the subject. Thanks again, have a good one!
But what if you Want more bass from your HPF filters? I just use an O-scope and set my input volume (phone) and headunit to max with my equalizer settings preferred and adjust both gain and hpf until I'm in no clipping territory and have achieved as low of hz as I want. I don't know howto do it more detailed and down to the science despite watching a lot of videos and reading.
If you are happy with the sound then you should be good.
@@DIYAudioGuy I really appreciate the response DIY Audio Guy. Really appreciate the content too. You are one of the guys I've been liking following closely on CZcams. Thank you for all the work your doing on us newer guys behalf and putting it out here for us! 💛
Hi thanks for all your videos, really helps a lot. I have a question, where are you getting your starting voltage from (could it be where the head unit and amp are set at the moment) and do you set this before setting the subsonic filter? Thanks
I saw it in your other video thanks
Awesome!
how do we find out how many db per octave our amp is?
Should be in the manual.
I'm a big fan of your videos but i have a question my amp says -12db could you explain me the difference please thank you for all you do
Not sure. What amp is it?
@@DIYAudioGuy taramps smart 5k bass thank you very much for replying most people never do
@@tonydize3944 I don't have any experience with that brand, so I can't say for sure. My best guess is that it's a bass boost and the - 12 is off. If you tried searching online for an owner's manual?
@@DIYAudioGuy thank you again friend you're always replying to your followers i see all the comments I watch your videos every day just to learn more in fact i was watching them right now keep up the great work you do 👏🏻
What app is that
Does the DMM have to be true RMS for this to work?
Yes! BUT! Oscilloscopes have gotten so cheap lately that I would just skip this and grab an O-scope. czcams.com/video/oBNETr9AHwA/video.html
When setting the Crossovers, Should your gain already be set?
Yes
How to you reach on hpf 2000hz?? How do I get that frequency? Are the hpf numbers by 10? 😢😢
Sounds like you're trying to cross over a tweeter. Most amplifiers are not designed to do that. Some will have a 10x switch on them that will multiply the crossover by 10. Look for an amplifier that has that. All of the JP series 4 channel amplifiers have the 10x switch. Hit the down for sound link in the video description.
How do you set a gain and xover for tweeter @125rms and xover @6000hz? I can do this for 150hz, 50hz, etc but the multimeter isn’t reading the way i expected.
Interesting, what is the multimeter doing? Most multimeters can read the frequency, try a 6,000 hz test tone and see if the multimeter can read the frequency.
@@DIYAudioGuy yep I did and the voltage didn't read like a 150 tone, it read like 4.3 instead of 22.00
I honestly don't know what to tell you.
Two questions. 1- If I set my low pass on my sub to 120HZ, then my 4 sets of components on the 4 channels high pass to 120Hz do I run the risk of canceling out in certain areas where the speakers won’t play sound? 2- if I want my rear 6x9s to act as my mid range and play a full/band pass so I can play between 120hz-500Hz how would I do this if setting the voltage for channels 3/4 would require tuning the same channel for proper cut off on the other end?
1) Yes, a 2nd order Linkwitz-Riley crossover will have a null at the crossover point. It is easy to fix just flip the polarity on the sub. If it sound better then keep it that way, if not then flip it back.
2) Set the voltage the same, you just need a bandpass crossover.
how do you know what test tune to use for the unfiltered voltage?
If you're trying to set the crossover at 80 Hertz then play in 80 Hertz test tone.
@@DIYAudioGuy ok so that's generally for subwoofer, correct? And what frequency should I play for full range speakers? These are probably dumb questions but I'm fairly new to all this.
@@mcfriedchicken1972 1,000hz. There are no dumb questions.
Hang on, I Just give you a terrible answer. Ithought you were asking a question on a different video. If you're trying to set the high pass on an amplifier for some coaxials or a set of components then you would also use 80 hertz. 80 hertz is kind of a standard starting point for crossovers.
Whats the calculation for high pass
It is the same.
Enjoying your videos! Sorry if I have multiple questions on different videos, but what do you mean unfiltered voltage? Is this with a tone playing? Volume set to highest without clipping?
Unfiltered, as in the crossover is not on, or not doing anything. it is with the tone playing with the volume does not have to be set to maximum. You just need enough volume so that you can read a voltage on the multimeter.
Keep the questions coming. I'm sure there are others with the exact same question that would like an answer. If people are asking questions it means that I need to make another video on the topic.
@@DIYAudioGuy awesome and thanks again. Definitely made a new subscriber.
@@DIYAudioGuy where did you get voltage factor
@@chevy1560 =10^((slope/2)/20)
What if you don't have a DSP is it still possible to do
I just used The DSP to verify that my math was correct.
When you use bandpass do you have to set the high pass also?
Yes -- you would be shocked how much midrange and high frequency will still get through the port.
@@DIYAudioGuy do you have a video on that
Are the gains set before this or after?
Before.
Is the volume all the way up before clipping?
You don't need the volume all the way up when setting crossovers. It's just a matter of comparing the voltage before and after. I show how to check for clipping in this video: czcams.com/video/L0ZXq2eo-OM/video.html
DIY Audio Guy ty sir. Getting ready to do a install in my 300 as soon as my package comes in
So if my sub amp has a 12db slope and I want my cutoff frequency to be 30hz...would I multiply 30×.501? And set my voltage accordingly?
Correct.
Thank you for your time!
The way you set crossover seems to be different from others. On other videos, people will play the frequency that they want their crossover set at, and whatever the voltage is when the frequency is playing, they will adjust the knob until voltage starts to drop and that’s where we would set it at.
One of us has to be wrong.
Take a look at what happens around 11:20. I turned the crossover on and I turned the knob all the way to the right. So the crossover is set to 500 Hertz. At that point the voltage is just slightly less than the starting voltage. So if you use the other method your crossover would be set to 500 hz, not 50. Those other videos have thousands of views. Which means there are thousands of people out there with crossovers that are off by an order of magnitude. You will notice that in this video I verified my math by comparing my predicted results against the result I got from the digital signal processor.
The crossover frequency point is always -3dB. So setting to crossover to 80hz means that there will be a -3b or 30% reduction in voltage at 80hz. This video shows exactly that
Crossovers can get pretty complicated. I'm not 100% sure that I have it right. But I've seen some CZcams videos, from larger channels that should know better, that absolutely have it wrong. Not trying to cast shade on them, just trying to help people.
Most amps have fixed slopes. The setting up for a target crossover, at an assumed frequency where the amp labelling is, could be inaccurate. If say one rotates the knob to a 90 hz lowpass, the only sure way to know IT has kicked in at the right frequency, is to start Sweeps and record the voltage where it changes. Burst tones are more accurate, at increments of one.
There are audiophile test cds with these tones. The track number and test tone at certain frequency is given.
What app do you recommend for android devices?
I don't have any particular app that I recommend.
Is the multiplying factor always the same for each slope type? Or does that need to be calculated depending on different factors?
It's different for each slope.
@@DIYAudioGuy the voltage factors are as shown? So for future reference if I were to do the math. A 6db per octave slope will always have a voltage factor of 0.708?
Yes!
@@DIYAudioGuy ok, thanks! Isn't math fun? Lol
I think so.
What "noise" should I use to do these settings? I need to set two amps. One with subs and one with 6x9's.
Play a test tone equal to the frequency of the crossover point you wish to set. So if you want to set your crossover at 80 hertz play in 80 hertz test tone.
@@DIYAudioGuy Do you have any base test tones you would suggest for the speakers mentioned? Sorry, I’m a total newb. Lol.
I guess I should add that the 6x9’s are 2-way.
What would be the voltage factor for that subsonic filter?
Which subsonic filter?
If I'm saying this correctly. The subsonic is to keep your sub from dropping below its lowest frequency response. Say your sub has a frequency response from 28hz-300hz. You would put the subsonic at 30hz so it cant drop below 28hz and damage your sub. The amp gain or voltage doesn't factor what your subsonic setting is. I think your box tune does tho. If your box is turned at 32hz if your sub plays lower than 32hz it can damage your speaker. So you would want a subsonic at 32hz or slightly higher.
The rule of thumb is that you should set your subsonic filter one half an octave below your tuning frequency. So if your tuning frequency is 32 hz multiply that by 0.75 and you should get 24 hz.
@@DIYAudioGuy oh ok, thanks
czcams.com/video/iWRoIho7A7c/video.html
Can you please explain how you came up with numbers in excel sheet?
10^(.5*slope/20)
I am little confused. In every article and video they have asked to multiply by 0.707 irrespective of slope. Isn't the meaning of cut off frequency is that it is 3db down from 0 db or. 707 of original value whatever the slope may be?
@@Dilpalsingh I've noticed the same thing. But as you can see in the video my math matches the digital signal processors output. I'm open to the idea that I might be mistaken, but if I am then this DSP is doing it wrong. I figured all the math out before I took the measurements.
Can you please tell the name of DSP app used? Thanks for prompt replies.
It's the app that controls the Dayton DSP 408.