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.
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.
I found this http://www.tkk.fi/Misc/Electronics/circuits/speaker_to_line.html page is this an ok way to do it ?
no,
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.
Conclusion:
It's far easier to feed the wideband signal to wideband amplifiers feeding full range speakers, with or without passive crossovers.
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.
Conclusion:
It's far easier to feed the wideband signal to wideband amplifiers feeding full range speakers, with or without passive crossovers.
I open it about once a week to tweak - Status
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