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Old 17th May 2009, 07:51 AM   #1
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Join Date: Apr 2009
Default how to connect sub amp

Hi frst of all I have built 3 chip amps with the help off this forum and only had to ask once. Excellent forum. But now i have a question that I can't find the answer.
I have an amp with two 3876 for 8 ohm speakers and one 3886 for a 4 ohm passive sub. My question is how do I connect the sub amp , where does the input come from. I dont really want to add a whole lot of extra circuits. I think i found a thread once that said connect a 10k r to the output and use this as input to the sub amp. is this a good idea ? any help appreciated.
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Old 17th May 2009, 03:01 PM   #2
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I found this page is this an ok way to do it ?
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Old 17th May 2009, 05:21 PM   #3
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
that is just an attenuator.

You need at least a low pass filter (= half a crossover) to feed the bass amplifier.

You should fit a high pass filter (=the other half of the crossover) to feed the two mid/treble amplifiers.

You should also fit a summing circuit to couple the two channels together to feed the single bass speaker.

You may need a phase invert or phase adjust for the bass amplifier.
You may need a high pass filter for the bass amplifier.

You will need a PSU to feed the new circuitry.

It's far easier to feed the wideband signal to wideband amplifiers feeding full range speakers, with or without passive crossovers.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 18th May 2009, 01:11 AM   #4
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Ok thanks, I will experiment and see what comes out of it.
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Old 18th May 2009, 11:07 PM   #5
dangus is offline dangus  Canada
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Location: Vancouver Island
Watch out for a used car audio electronic crossover, and power it from a 12V AC adapter.
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Old 19th May 2009, 12:12 AM   #6
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Thanks that sounds like a good idea. For now I just took the signal from one of the speaker outs with a 10k to the input pot of my sub amp. then a passive crossover for the sub woofer. It seems to work fine. but there is always room for improvement. I open it about once a week to tweak
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