thornev
Super Member
I forget where the thread is (found it, see below), but Dave G posted a schematic that allows one to send the left and right channel signals to a subwoofer. I've been using it for a while.
The problem is that the signal sent is loud and I have to have the volume control on the subwoofer not even to 1. I would like to reduce significantly the signal so that I can turn the subwoofer volume up.
I assume the way to do this is to stick some impedance in the signal circuit. There is already a 1K ohm resistor on the circuit board, one for each channel. I tried piggy-backing a 240K resistor across the 1K ohm resistor, but it had no effect on the signal level.
I would post the schematic, but I cannot find it at the moment. It's pretty simple. It captures both channels with a 1K ohm resistor on both channels and sums the channels into a single channel so that both left and right signals are received by the subwoofer.
Can someone tell me how I would execute this signal-reducing addition to the circuit? Thanks. Thorne
UPDATE: There is no schematic. It was Dave G in this thread, post# 3, where he suggests the circuitry:
http://audiokarma.org/forums/index....itch-for-center-speaker.801666/#post-11323174
BONUS QUESTION: is there some way to control the frequency below which the subwoofer gets the source signals? For example, if I want only frequencies below 100Hz to be sent to the sub, there must be a circuit for that. A low pass filter, right? I'll look around too.
http://www.learningaboutelectronics.com/Articles/Low-pass-filter.php
The problem is that the signal sent is loud and I have to have the volume control on the subwoofer not even to 1. I would like to reduce significantly the signal so that I can turn the subwoofer volume up.
I assume the way to do this is to stick some impedance in the signal circuit. There is already a 1K ohm resistor on the circuit board, one for each channel. I tried piggy-backing a 240K resistor across the 1K ohm resistor, but it had no effect on the signal level.
I would post the schematic, but I cannot find it at the moment. It's pretty simple. It captures both channels with a 1K ohm resistor on both channels and sums the channels into a single channel so that both left and right signals are received by the subwoofer.
Can someone tell me how I would execute this signal-reducing addition to the circuit? Thanks. Thorne
UPDATE: There is no schematic. It was Dave G in this thread, post# 3, where he suggests the circuitry:
http://audiokarma.org/forums/index....itch-for-center-speaker.801666/#post-11323174
BONUS QUESTION: is there some way to control the frequency below which the subwoofer gets the source signals? For example, if I want only frequencies below 100Hz to be sent to the sub, there must be a circuit for that. A low pass filter, right? I'll look around too.
http://www.learningaboutelectronics.com/Articles/Low-pass-filter.php
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