Hello there,Just wanted to thank you for all your "educational electronics videos" I used to work as a office machine repairman.....kind of a mistake for an electronics enthusiast to get a job as a repairman.....I got burned out on seeing electronics in front of me everyday.....I backslid away from electronics and such as an enthusiast .....I've been retired now for several years.....and now after watching your series of videos on fixing stuff and inventing custom circuits that are really good, You have rekindled my intrest back into fun stuff with electronics, and that I thank you for.....I love audio and amps and stuff. You are entertaining, you say funny things, and I'm not sure you realize it or not but that's OK.THANKS AGAIN AND KEEP EM COMING
John, if you've not already discovered this Equalizer APO is a fantastic little program for your PC that can digitally create some very nice filters. I use it to not only do calibrated room EQ but to also take the low frequencies from Front, center, back channels and direct them to the sub using a 48db/oct filters hi and low pass. Makes listening to music on my PC very nice when I'm in m home office. I know going digital is cheating compared to a circuit, however the ease of use and results are fantastic. Edit: Correction, I'm actually using 24db/oct filters. The program can do 48/db oct.
Hi John, Nice build and demo of the 3rd order filter, sounds like it works great. Happy 1st, ain't no fool, like an old fool, me of course. Take care, C.
I know this is an old video, but a few questions - 1) is there a advantage to using inductors in the filter instead of resistors, IE a steeper cut-off? 2) would using inductors decrease the phase shift? Best video I've found on sub filters, thanks....DA.
IscleGaming | ZefaCraft it comes to play if there are other speakers playing same frequency with another phase, say one speaker playing with no phase shift and another playing with 180 degree phase shift results in undesirable attenuation of sound.
Deepak A Oh, so if i build this low pass filter for a 2.1 setup with a high pass filter, it won't affect anything right? (assuming that the other speakers don't play in the same frequency range as the subwoofer)
Yup, and that is just the extreme case. Any time you have two drivers spaced apart and producing the same frequency, you end up with a lumpy 3-D dispersion pattern. To understand this better look at what happens with the double slit experiment, and the diffraction pattern developed by the particle model.
Phase shift is not delaying the signal. Example, having a 180 degrees phase shift on one speaker and no phase shift on another playing the same frequency (let's say 60Hz), what happens is you'll end up with a lack of bass, so to speak, because one signal cancels the other signal out.
It should not be noticeable as the rolloff is fairly steep. I think room acoustics such as standing waves and nodes with the bass frequencies is much more of an issue with audio.
Hi John, do you know if it is okay to use the LM358 differential op amp or the LM1458. I think it would be okay so long as it's not set up that way. thanks mike
Hi John thank you for your fantastic videos I was wondering if it would be possible if you could do more reviews from apps that you can get from eBay or band good they are very cheap and some of them seem quite interesting Bluetooth modules etc. I have been making a Bluetooth powered speaker but have been having some problems with the noise from the Bluetooth module they don't seem to like sharing the power. Regards Andrew
Your speaker is going to be the big factor there. If the speaker booms, it has a strong resonance at a particular frequency, usually because of poor design. Only electronic correction would be a parametric Eq dialed into that freq.
As long as your source signal impedance is low, I can't see any effect of swapping the stages around. Don't change the gain though as it allows the filter resistors and caps to be the same value in the 2nd order part. Boomy bass to me is a peak in the response in the 60 to 120Hz range (sounds awful like cheap consumer crap). If I were a bass head, I'd want a peak in the 35-45Hz range where the bass would sound lower and powerful. This is best designed in the woofer/subwoofer itself by tuning the box/port design.
Hello there,Just wanted to thank you for all your "educational electronics videos" I used to work as a office machine repairman.....kind of a mistake for an electronics enthusiast to get a job as a repairman.....I got burned out on seeing electronics in front of me everyday.....I backslid away from electronics and such as an enthusiast .....I've been retired now for several years.....and now after watching your series of videos on fixing stuff and inventing custom circuits that are really good, You have rekindled my intrest back into fun stuff with electronics, and that I thank you for.....I love audio and amps and stuff. You are entertaining, you say funny things, and I'm not sure you realize it or not but that's OK.THANKS AGAIN AND KEEP EM COMING
Thanks for your quick backstory and so glad to have rekindled your interest in electronics.
John, if you've not already discovered this Equalizer APO is a fantastic little program for your PC that can digitally create some very nice filters. I use it to not only do calibrated room EQ but to also take the low frequencies from Front, center, back channels and direct them to the sub using a 48db/oct filters hi and low pass. Makes listening to music on my PC very nice when I'm in m home office. I know going digital is cheating compared to a circuit, however the ease of use and results are fantastic. Edit: Correction, I'm actually using 24db/oct filters. The program can do 48/db oct.
Thanks Jeff!
Awesome software :O:O
...If it works well with your audiocard.
I really enjoy ur vids since im very interested in electronics in General and congratz to ur 6k Subs best of luck for the future!
Don't worry John, your videos are interesting to anyone that understands electronics.
Hi John, Nice build and demo of the 3rd order filter, sounds like it works great. Happy 1st, ain't no fool, like an old fool, me of course. Take care, C.
the ad that I saw was ghost in the shell, watched the entire ad!
Mine was a robot lawn mower, INTRIGUED!
Haha like the little out takes at the end.
I know this is an old video, but a few questions - 1) is there a advantage to using inductors in the filter instead of resistors, IE a steeper cut-off? 2) would using inductors decrease the phase shift? Best video I've found on sub filters, thanks....DA.
good
How does the fase shift affect? Does it mean that it will sound a bit later than it should?
IscleGaming | ZefaCraft it comes to play if there are other speakers playing same frequency with another phase, say one speaker playing with no phase shift and another playing with 180 degree phase shift results in undesirable attenuation of sound.
Deepak A Oh, so if i build this low pass filter for a 2.1 setup with a high pass filter, it won't affect anything right? (assuming that the other speakers don't play in the same frequency range as the subwoofer)
Yup, and that is just the extreme case. Any time you have two drivers spaced apart and producing the same frequency, you end up with a lumpy 3-D dispersion pattern. To understand this better look at what happens with the double slit experiment, and the diffraction pattern developed by the particle model.
Phase shift is not delaying the signal. Example, having a 180 degrees phase shift on one speaker and no phase shift on another playing the same frequency (let's say 60Hz), what happens is you'll end up with a lack of bass, so to speak, because one signal cancels the other signal out.
great video, but will you notice the out of phase signal with reference to the right and left channels, as if it were off beat?
It should not be noticeable as the rolloff is fairly steep. I think room acoustics such as standing waves and nodes with the bass frequencies is much more of an issue with audio.
Hi John, do you know if it is okay to use the LM358 differential op amp or the LM1458. I think it would be okay so long as it's not set up that way. thanks mike
Hi John thank you for your fantastic videos I was wondering if it would be possible if you could do more reviews from apps that you can get from eBay or band good they are very cheap and some of them seem quite interesting Bluetooth modules etc. I have been making a Bluetooth powered speaker but have been having some problems with the noise from the Bluetooth module they don't seem to like sharing the power. Regards Andrew
Thanks Andrew, I have a lot to do on this channel and probably will do this at some point.
I used to run 96 db crossover on my speakers,but I implemented it in software
Can we use the 2nd order filter at first and the 1st order filter at second position to create a 3rd order filter ?
JAT, Why do you use 2K2 right and left combining resistors?
whats the name of the device that displayed the signal graph
oscilloscope - its either a Siglent or Rigol, can't remember which one
do the 2 2.2K resistorsgo on theinput side of the power amp? i have a STK433-330 pwr amp and trying to get it to have left right and sub out put.
yes, they go at the output of the preamplifier before the inputs of the power amplifiers (normal 2.0 stereo)
hi is there any difference if I swapped gain stage and buffer stage? what should I do to get punchy bass than boomy bass ?
Your speaker is going to be the big factor there. If the speaker booms, it has a strong resonance at a particular frequency, usually because of poor design. Only electronic correction would be a parametric Eq dialed into that freq.
So Punchy bass is just a good performing system, reasonably smooth response , plenty of power and good cone excursion.
As long as your source signal impedance is low, I can't see any effect of swapping the stages around. Don't change the gain though as it allows the filter resistors and caps to be the same value in the 2nd order part.
Boomy bass to me is a peak in the response in the 60 to 120Hz range (sounds awful like cheap consumer crap). If I were a bass head, I'd want a peak in the 35-45Hz range where the bass would sound lower and powerful. This is best designed in the woofer/subwoofer itself by tuning the box/port design.
JohnAudioTech thank you. If I have a ported enclosure, filling it with sound absorbing material is a good/bad idea?
Hi . Is that an Average White Band track ?
No, it is from the CZcams music library so that I don't get a copyright violation.