Set your AMP gain with a MULTI-METER, the cheap and easy way!
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- čas přidán 15. 07. 2024
- In this video I show you how to set your gains with a cheap DMM.
To learn why you should not use a DMM click here: • DON'T SET AMP GAIN wit...
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0:00 Introduction
0:18 Choose a Quality Amplifier
0:43 The DMM
1:00 Test Tones
1:18 Calculate Target Voltage
1:48 Voltage when Bridging two Channels
2:00 How to Adjust for a Speaker that Can't Handle Full Amplifier Power
2:20 Connect and Set Up the Amplifier
3:30 Probe the Amp and Adjust the Gain
*As an affiliate/associate marketer I may earn a small commission on qualified sales. - Auta a dopravní prostředky
A viewer asked me for some help -- he lives on the other side of the globe and does not have access to the tools available in the US. But he does have a DMM. You can do a lot with a DMM, get one if you don' t have one.
Multi-meter (inexpensive option): amzn.to/3exHjiD
Where'd you get the Blaupunkt? The memories...
Thanks for the video,wasn't sure if I had my gains right and only had a multi-meter. Kudos!
Amazon: amzn.to/2YDhqXM
They are not what they were back in the day, but they are cheap and they work.
@@DIYAudioGuy Should i set my gain before or after setting crossovers?
Very simple easy to understand tutorial for setting the amp gain. Now my problem is this. I used a 50 Hz test tone to set my subwoofer amp gain to 31.62 volts ac with head unit at 75% volume. Amp is similar to the video, RF prime 500 watt rms monoblock, pushing a 500 rms 12” d4 sub wired parallel at 2 ohms. but now I have almost no bass? What am I doing wrong? I believe the issue is the test tone vs playing music where the rca signal voltage varies and is generally much lower on average vs the max signal voltage using the test tone. That’s my guess anyway.
Me useing the exact amp he said not to use
That Alpine is okay bro
Super easy to understand video and a solid full-proof way for anyone to set gains without spending a bunch of bucks. We need more useful videos like this in car audio. Thumbed up and subbed!
That's what I was shooting for.
I have been watching a crap load of videos all day on setting up amp gain on my amplifiers. I had watched several that were great, and some that should not even be allowed to be watched. I had came across yours and your video was THE BEST of all of them. Not only did you explain the why and the reasons, but also for if one had speakers that were rated lower than their amplifier, which was one of the things that I was looking for. Explaining the target voltage was clear and understandable. Even though I understand electricity, your explanation was direct and to the point.
Thanks for a great video!
Glad to be of help!
Hands down the BEST tutorial on CZcams for this. Answered every question I had -- when other tutorials didn't. Thank you so much!
Thanks!
New Sub!!! Thank you so much for this video, just installed a complete Timpano system and no one could tune it; thanks to this vid I could finally tune it myself and now it sounds great and it’s not clipping at high volumes! 🙌🏼🔥
Fantastic I hope you get a lot of joy out of your system.
Fantastic video! Didn't get snarky with viewers who complained. Didn't try to sell an overpriced in house product. This guy, is subscribed!
You are far to kind. Thank you.
This guy is the best. Unlike most other channels this guy explains things very well.
You are too kind.
I stumbled on this video looking at one of your other videos and this answered a question I've been having for a while. I assume this would be a good way to match the outputs of two similar but not identical amps. Thank you very much for making this video!
Yes, this is a great way to gain match two amplifiers.
Awesome video I used my liumy O-scope to set the gains on mine and I made sure to write down the voltage I was getting on each one since it shows it to the side👍
I do it the same way.
Great way to set gains without breaking the bank on single use tools. Thanks DIY Audio Guy!
I have some more short videos like this on the works.
One of the best illustrations of gain settings, out there! Easy subscribe!
Thanks for the sub!
Bravo! This is your best video to date
Thank you!
I like you guy, pretty cool how you shouted out all the other channels I been watching
Yea, there is so much great info on CZcams. Not like it was when I was a teenager. You just had to trust the shop selling the gear.
@@DIYAudioGuy I have found the issue. It was something with the rca but it is all fixed now👍Thanks.
Directly to the point, I subscribed!!! T.y
Welcome to the adventure!
So why did we get a square root for the amp Nd subs??confused
Last week I tried tuning my setup by ear like I have done since 1993. Well, I am using a Taramps hd3000 which is notorious for clipping with weak electrical. Long story short I over estimated my ear and clipped the sub to death. Ordered another sub and today, after watching this video, I set the gain with my multimeter and man that was easy. Thank you DIY Audio Guy
Just the other day I was helping a friend set gains with my O-scope. He has a buddy that used to work in a shop and his buddy set it by ear. Dude did not trust the ear method, but according to the O-scope it was dead on perfect.
Great info first time user setting my gains, this video help dummies like me and you made very simple.
I'm glad it was helpful.
@@DIYAudioGuy just got done all is set now, i did make one little calculation error i got Rockford 300x4 and i did the math for 75 watts instead of 50..lol clip light came on when i was trying set it 17.4 and I said to myself something is not right. It should of been 14.14. Once again thank you for the great info!!
Great information thanks. One question I have is should I use the amp's quoted "RMS" wattage or the quoted "MAX" wattage? And the same for the speakers.
RMS, for both.
Never EVER go by "Max" or "peak". These are pretty much meaningless ratings
Great information. What if I have a bass knob (I do)? What do I do with that?
That's going to depend on the amp and how the knob operates. But, if the goal is to prevent clipping then you will want to turn the bass knob all the way up before you set your gains. That way you will not clip with the knob all the way up.
@@DIYAudioGuy Thanks for the response!
Thanks very much. Now I can try to do this tomorrow for my 1500 amp RF.
I have set my gains according to your video and now I have no problems on my amplifier. Thank you. My subs pumps hard and it never did clip. Again thank you.
Awesome, glad it worked!
Amazing content! just what I needed as I am in the process of a full car audio set up! Just subbed too!
Thanks.
Great failsafe way of setting gains. Awesome!!!
Appreciate it!
I wish the headunits had a lock point for the volume knobs on the units so that you can turn it wide open to 100 & its fine.
Its called source level and in aftermarket head units can be found in settings. Eave though if you are using an good quality amplifier it doesn't matter if the head unit is clipping. The singnal going in the amplifier is going through a procession that removes clipping from the input. That's why it's so important to adjust gain correctly
@@andreasbongdacity2854 well, the subs are going to amp, but .....4 door speakers are feeding from the Sony head unit. 55x4 Im gonna look for sourse level this evening, if I find it I will bump it down just a hair. thanx
kenwood has a volume offset setting so you can set your max volume setting
1000% agree with you mainly for customer to keep them from blowing up equipment when they play some trash quality file over bluetooth. Personally i could care less as long as the knob adjustment is fine enough and doesnt have massive jumping in level each number. Since the numbers to me are worthless i use my ears.
@@andreasbongdacity2854 This is completely false. There’s no way to remove clipping from a signal. You can counteract it by turning down like how a compressor works but it’s still going to be a distorted wave.
Thank you so much I just needed this
Glad it helped.
Great video. Setting up a system. Amp at 240 RMS bridged to 250 RMS speaker. 4 ohms. (240×4=960) square root 30.98... that will be my max voltage on the multimeter.
Other speakers: 100 RMS amp to 150 RMS speaker. 4 ohms. (100 x 4 = 400) square root is 20. So multimeter AC volts should be max of 20.
Hope this looks correct.
Your video was amazing!!! Huge help and so simple! Thanks!
Looks right to me.
I have a question for you. I always run my head unit bass setting at negative 4, so that my dash and door speakers don't get too much bass. Those all run off the power of the head unit, no external amplifier. Even at negative 4, the door speakers are plenty loud and have plenty of bass. When I set the input gain on my subwoofer amp, would I want to leave the head unit's bass setting at negative 4, being that's how I always run it? Everything I've read says that you want to set everything to "flat", which doesn't make sense to me if that's not how it's normally ran.
You have to set everything flat to get an accurate reading, and a lot of times people will turn on their bass boost or crank their bass up causing clipping and distortion. If you're trying to shape the sound it's always better to cut instead of boost. Since you are cutting you're probably not going to do any damage. but you're not going to get the best possible sound either.
If your head unit has a crossover then you can use the crossover to pull the bass out of your door and dash speakers.
In the end always remember that it's your gear and you can set it up anyway that you like.
@@DIYAudioGuy Thank you!
Had to sub, I hope I can have your help when my equipment is installed. Very informative video sir.
Thanks for the sub!
I was going to say I have that same amp... but that's a R400-4D and I have the Class AB R300X4 haha.
Also really clear and on point. Good job!
Both are great amps.
@@DIYAudioGuy Indeed. Mine was pushing my Ultimax 10 for a while with Channel 3 & 4 Bridged. Didn't complain one bit. Now I have a dedicated amp for the sub though.
Hell yeah brother!
Best video on here for setting the gain! Thank you very much!
You are welcome.
@@DIYAudioGuy Quick question sir. I’ll be setting up a 5 channel amp in my 4Runner.
-Let’s just say on one of my channels, I have a door speaker and a dash speaker wired in parallel.
-both speakers are 4 ohm, and rated for 100 rms each.
…I’d be running a 2 ohm load. So what is the equation for that?
Hello diy audioguy. Thanks for your videos. The gain is adjusted for both subwoofers and mid and high speakers with the same Output Power (14.4 V) @ 4 ohm. This is the Output Power specification for the Powerbass Amp ASA3-700.5
OK.
100% helpful and to the point.
Glad you liked it!
Learning a lot...thanks! 👍
Great videos. Doing a full install now. Was 2nd guessing my ohm configuration and set gains properly using voltage formulas or DbMv
👍
I had to slow down your video to makes sure I got it thank you awesome
Thanks for watching!
Great video! Helped me a lot
Glad it helped!
Great info man thanks
No problem 👍
Great video I’m having a problem setting mine up , I’m gonna try your tactic hopefully that works , will let you know
Awesome! Good luck.
Great and simple explanation. Thank you!
Glad it was helpful!
Dude. Gonna try and do this right now on my powered kicker 10”
🤞🏼🤞🏼
Great video, very informative!
Thanks!
Very helpful video 👍 and good presentation.
Glad it was helpful!
Badass video and an exact way to do it!
Absolutely.
Simple and usefull. Thank you
I like the new format, i have a 04 ram ur videos help me a lot, do you going to show the performance of the sound system?
I was hoping to get to a MECA show and enter a SQL competition, but it has not worked out.
Great info .thanks
Glad it was helpful!
Every 'pro' audio guy I have ever talked to has these 'hard limits' like you just mentioned (3:13) but I firmly believe it is 100% because of how you guys learned to do stereo stuff.
Everything I learned was from practical application or self taught and I'll admit I have blown some equipment, but the limits you guys mention are hilarious and the things you think will happen if you go above/beyond those limits are wholly comical. 99.9% of the time, unless you have wired something very, very wrong or have gone hilariously above the limit (on purpose a huge majority of the time), you're probably just going to get protection mode constantly, distorted sound, or overheat your equipment over and over.
Unless whatever you are using is old or was beat to crap/put over it's limits consistently for weeks or months, you're more then likely ok to prod those limits with trial and error.
Better to be safe than sorry. If you need it louder, buy better equipment.
I constantly blow subs and speakers from overpowering them cause I’m too cheap to have someone with a DD 1 set them and I just set it by ear. 😂🤦🏻♂️
Thanks for the tips brotha. Just installed a new 12" at a different ohm load than my previous sub.🤞 I dont blow this one 😆
I went with a nvx nsw124v2 since it was cheaper than buying an amp for the VSW's I have laying around
If you are a big NVX fan you can use the code diyaudio10 for a discount on the NVX website.
I like how u did this thanks
Your Welcome.
Nice video, thanks!
Thanks!
Thanks for the awesome help!
Happy to help!
Your videos are the best. Should I use the test tones you recommend at o db
0db test tones are fine.
Great stuff! And the Gain knob is not a volume knob! 😁.
Thanks!
Thanks for the vid
I am glad you liked it.
Great informative video. I Know nothing of car audio but little by little piecing together different videos I’ve managed to install a pretty decent system into my car. Now with this video I’ll be able to adjust gains so I don’t blow my shit lol. Sometimes it sounds like my songs are screaming at me.
Awesome, I'm glad you found it useful.
You can check the preout voltage of the head unit through the rcas
Set multimeter to ac
Play a 40hz tone with the rcas unplugged volume max(whatever it is for you probably 3/4 like he said in the video)
Probe the male end with positive and the shielding with negative
Boom preout voltage, look online to figure out how many v of clean preout yours is and match from there turning the volume up or down if needed
By the way if your amplifier is in a hard to reach spot or you can’t get to the speaker terminals of the amplifier, you can measure at the end of the speaker cable where it connects to the speaker. Just make sure to disconnect the speaker and measure the speaker leads.
Yes, that works.
Hi, thank you very much for this video. Literally the most useful one on CZcams. Keep it up. Quick question, can this be applied to underseat sub ? If not,is there anyway to set the built-in amp on underseat sub. Thanks
Not unless you remove the subwoofer or the amplifier from the enclosure. Honestly the best way to do one of the other seats subwoofers is to just set it by ear. It sounds like crap turn the gain down.
@@DIYAudioGuy much appreciated for the response 👍
Perfect explanation
Glad it was helpful!
Nice video 👍🏼
👍
Great Video
Thanks man!!!
Glad I could help.
You should be able to find the clip point by testing the voltage @ your rca outpout. If the headunit specs call for 4v preouts then youd look for that AC voltage testing the center pin and outer shell of the rca.
Correct. I have some RCA to speaker wire pigtails that I use for testing RCA's. Much easier than trying to hold the probes against the RCA wire.
Finally!! Not some over complicated bs that suggest you buy $200 meters. Thank you!!
Glad to help!
@@DIYAudioGuy do you have a video on setting the LPF at exactly 80 hz for a sub amp?
czcams.com/video/bNauOkzdTRM/video.html
Great video. Subbed. .
Awesome, thank you!
Thanks
After watching all your videos , I installed my amp and speakers. sounds great. The only question I have is that the voltage per channel is 16.12. The rear speakers have a volt of 24.5, do I setup the amp for the per channel voltage 16.12 or for the rear speakers to 24.5. Note. the front speakers and a voltage of 14.14 Thank for all the information
You typically have a separate gain control for front and rear, set them both either based on the power rating of the amp or the speakers, whichever is smaller. Another trick, if you want to emphasize the front stage you can reduce the gain on the rear channels.
For those fine adjustment knobs drill a hole in a ruler big enough to jam the screwdriver in. Then you have an adjuster with a wider arc and you can hit those mv numbers.
Clever trick.
Subbed. Nice thanks
Thanks for the sub!
Because people trust and like you... We need you to do this same set up... But on a head unit with a subwoofer channel.... And a amp with a bass knob... So people understand that the subwoofer channel level is not a volume..it works like a fader in can be at max 10 when you set up your deck and amp... And people need to know that a bass knob needs to be in full before you set your gains.... These these are two very important factors... That have only caused arguments on Facebook groups... Why I'm asking you is Cause I've taken electronics.. and You speak my language
That video is definitely on my list. Just waiting for a good chance to make it.
I was looking at Alpine S-A60M 600W RMS amp, it was measured at 14.4 volts and 1% THD. That's not lying about it I agree that.
I think this is the older version of that amp. Great stuff. czcams.com/video/QggLZb77_sU/video.html
@@DIYAudioGuy Yes, older ones are good. Just dont get this new trend, how they kinda cheat the rms power even it is the cheaper series of amps but it just makes Alpine look cheap
Oh wow that's really good to know about not going above the volume where I set the gain. If I want to give myself a little bit of headroom on the volume, can I set my gain at 85-90% volume?
The volume setting (75%) is just a rule of thumb, so you can always turn it up a little bit higher.
Awesome video. I think I missed the part about adding bass boost after three gain is on point. Anybody know if its safe to add bass boost after setting the gain?
I have a strong opinion about that: czcams.com/video/KSdnrBI7a90/video.html
just a question, to find my target voltage am i taking my:
*RMS power of amp and Ohm rating of amp* (RP1200.1D)
OR
*RMS power of amp and Ohms my speakers will be wired to*(RP1200.1D x Speakers wired to 2 ohms)
Other than this question pretty straight forward video!
You can use a DMM to find your head unit clipping by figuring out what your preouts voltage is from the manufacturer and then use a 0db 50hz test tone,turn the head unit volume all the way up as well as the subwoofer volume on the head unit,then run your test tone and attach the ground of the dmm to the outer pins on the rca and the positive to the center pin on the rca,say your preouts are 2 volt preouts. The dmm should read around 2.8 volts not the dmm,turn the volume knob on the receiver down till it hits the target 2 volts 😎
Ok so this video has helped me a lot but I’m not doing 4 ohm or 2ohm setup with my sundown SALT 4k rms amp. On the dyno it’s doing 5-6k watts and I’ll be running the amp at .5ohm final load. So since the amp says it’s 4k but on a dyno it puts out 6k what voltage should I use to set my gain on the amp then? 🥴 I’m trying to learn day by day! Again great video and subbed!
I think you are well passed the stage where you can get away with a just using a cheap multimeter. czcams.com/video/c-UTA59pfPA/video.html
Can you please also show how to set gains and crossover frequencies on an inbuilt amplifier. Pioneer ts-wx1210a thanks
I don't have any experience with that equipment.
Great informative video. So for instance, to obtain the square root of my amp. Do i go by “ RMS” power or max power to get the target power? I’m using the amp in your link description btw. Thank you!
RMS
@@DIYAudioGuy thanks!
Autosound 2000 (richard clark) used to sell a test CD with various frequencies that increased in volume to MHBL (the most output a CD can achieve) then exceeded it with an intentionally clipped signal so you can view what clipping should look like on your Oscope, then repeated the same tone up to MHBL without clipping it. I found a super simple (only went to 100khz) BK crt oscope at a surplus store for $100 and never blew a speaker again.
Richard Clark did amazing things. He now builds hot rod Buick Grand Nationals.
@@DIYAudioGuy was that a Buick he won the SQ championship with? (With USD audio HLCDs) Or was it a T bird? I love horns, there nothing else that sounds so impressive tho theyre a pain to tune.
@@johnlucier5654 Yep, a Buick Grand National.
I highly recommend using a bass control knob. It’s like having the gain control right on your dashboard for those old-school songs that need to be turned up
I recommend using one that has a clip light.
@@DIYAudioGuy well I bought a JL Audio JX500/1 for $149 on sale 6 years ago. So I’m stuck with their overpriced garbage pot with no clip light (SOLD SEPARATELY) But I’m an adult, so I don’t need a clip light anyway.
@@johnviera3884 That's a hell of a deal on that amplifier.
@@DIYAudioGuy $60 for the bass knob. Lol
It’s an ok amp.
S/N Ratio is only 62db
Do you use the nominal impedance (z), the actual resistance Re (often 3.5 to 3.9 instead of 4 ohms), or would you measure including your speaker wire?
Nominal impedance.
Cool idea. Might want to leave some headroom on the voltage you set - especially if you use a cheap multimeter. This is because every multimeter has some amount of measurement error. Or if you wanted to be really precise, your multimeter manual may show the specifications for error when making AC measurements.
There are a ton of ways that error can pop up, no matter how you do it. The amp, the meter, anything.
I adjusted the voltage to 17 because my amp's speaker output is 75 RMS per channel running at 4 ohms at 75% volume with an 1000 htz tone and i burnt my speaker coils because my speakers were only 25 RMS at 4 ohms.
If your amp puts out more power than your speakers can handle then you have to turn the gain down.
Sir this is helping me understand but what about the high pass?
Do you mean how to set the crossover? czcams.com/video/bNauOkzdTRM/video.html
This is a good rudimentary way to set gain without DD-1 or O scope. The only issue i see is you don't account for attenuation when running signal via Bluetooth. Most people run their phone volume to max when running BT and that can dirty your signal for sure.
Otherwise great video as always and keep the content coming.
That is a good point!
I might also add. I like how you recommend the kicker audio files for test tones. I'd rather point someone that route than to play a random tone generator. The files from kicker are setup with different recording levels 0db, -5db and -10db to help tailor your gain matching even further. Again in addressing attenuation I've always downloaded these files to either a CD or zip drive. You know 100% your signal is super clean that way. I do have a future video idea if you haven't done one yet. A full front to back gain matching. I.e. from the source unit to a DSP, EQ, ect. Showingthe importance of adjusting your gain from the source unit at every piece of gear in the line and ultimately at your amp. Great videos as always and your edit is coming along nicely btw. Keep up the great work.
Love the vid and how informative your channel is. I do have a question. If you are using a 4 channel amp, gain control for front,another for rear, do you only use the sum of the fronts to adjust the front and rear for the rear. Asking because I have an old USX4065, 65x4 @4ohm or 80x4@2ohm plan on front running at 2 ohm and rear running at 4 ohm. What I need to do my equations according to say 160 x2 for front and 130x4 for the rears. Not a large system by any means, 10 dbxi4d earthquake, run with hifonics herculesvii at 2ohm. Going in a 04 highlander.any help appreciated. Thanks. Love the channel
You just need to set the gains with one of the front channels. Unless you are bringing them, that is when you would use both.
Sorry for the late response, thanks a bunch. Starting the project with my 16 yr old new driving daughter, this is going to be her car as a suprise
Do you have a video showing how to calibrate a bass knob volt meter to be correctly in sync with the vehicles voltage
I do not.
Do you know any videos that do? I've looked around a bit but haven't found anything. I've been into car audio for a long time but sadly have never used bass knobs with with volt meters nor do i know how to calibrate it with my cars actual voltage.
Good day can you help me adjust my crossover which has a built-in line driver if 5v to match my mids and sub amp and what can I use if I don't have a DD1 available... Can a multimeter be used...?
For the Watts in the equation, do we use the RMS rating of the sub or the peak Watts?
czcams.com/video/NuO9b1fYisY/video.html
I will be adding a sub to my Jeep soon with a mono or Class D amp. When I run the tone though the head unit the sound will still play through the door speakers since they aren't amped. Do I really have to pull them all out and disconnect them at the speaker? Or is there another way to keep the tone out of the door speakers? Thanks!
. If your head unit has crossover controls you can disable your door speakers from the head unit.
Before adjusting gain, where should my bass boost , LP and HP filters be set at? Other videos have mentioned to set the bass boost at 0 and the LP and HP filters to highest before setting gain. What’s your opinion on this? Any advice would be appreciated. Thanks
This is correct. I'll make sure to include that information the next time that I make a video on setting gains.
Actually no, you want to hit maximum voltage with the bass boost set where you plan to use it. If you plan on adding some boost to certain music, turn it on to the highest setting, set your gain using this method, then turn the boost back down, now you know you can add some boost without clipping. It’s worth noting that if you use boost on your head unit, the max volume you can set it to may be lower. Instead of 75% volume you may be limited to 65% volume. You won’t know actual volume until you use an oscilloscope.
i have audiocontrol lc 6 1200 provide 125 watts RMS and focal 80 watts RMS 4-ohm impedance what voltages i should keep my amp gain please help
Great job explaining everything 👍
Thanks! What kind of amp are you running?
Do you multiply the rms by the lowest ohm the amp is rated or by your speaker impedance? My amp is 40wrms@4 or 60@2. My speaker final impedance with a tweeter is 2.66ohms. What do I multiply 2.66 with?
Thats good,the only thing i would like to understand is how to wire two 1ohm dvc subs please
Depends the load you want the amp to see. Example: If you wire the coils in series each sub will become a 2 ohm load. Then wire the subs in parallel to get a 1 ohm load at the amp. .
Hi there, great video and super helpful! I have a question tho... I have a 5 channel Alpine amp XA90V and everything is wired up to the speakers and sub and the install is complete. I have it tuned what I believe to be reasonably well be ear, but want to fine tune with a multimeter to get the maximum benefit out of the amp. Because of the location of the amp, I can access the controls but cannot remove the amp to plug the Multi meter directly into the terminals. However I can access the speaker terminals... Could I do the same process with multimeter at the speaker terminals and get the same result? Cheers.
Yes.
Awesome! Thank you for responding 👌
If your amps are very difficult to get to, can you use the wire at the speaker?
Can you teach us how to use a oscope to find where head units clip and how to set your gains with one.
Sure, I can do that.
czcams.com/video/oBNETr9AHwA/video.html
Is there a video to help set your Subsonic and LPF's with a multimeter?
czcams.com/video/iWRoIho7A7c/video.html
What deos it mean if my meter is only reading about 1.5-2.5 volts when i turn the gain up and with it off and 40hz playing im resting at less than 0.050 volts
I had always done this by ear. Just checked my setup and was within 1v of what it should have been. nice to know im close once in a while.
Back in the day the old school shops would set them all by ear. Even now there are some people who swear that the ear is the only tool you should use when setting up your system.