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Merging two channels with passive low passes
Merging two channels with passive low passes
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Old 10th April 2013, 10:01 PM   #1
OllBoll is online now OllBoll  Sweden
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Default Merging two channels with passive low passes

Hello there,

I'm planning to merge two balanced line level outputs into one:

If I've understood correctly the most simple way is to put a series resistor on each +- and then connect them accordingly.

However, I have passive first order low passes on the channels and I think that this low pass could fulfill both purposes but thought I'd check with the experts first =)
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Old 12th April 2013, 05:04 AM   #2
Chris Hornbeck is offline Chris Hornbeck  United States
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Your drawing will be fine for balanced signals, but if you have the usual unbalanced signals (hot and ground for each channel) the circuit will be simpler. Unbalanced signals essentially always have grounds in common, and these are simply connected to the sub amp's ground, no resistors in the ground's line. Also, you really only need one capacitor. Notice that your two caps are in parallel.

All good fortune,
Chris
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Old 13th April 2013, 12:08 PM   #3
OllBoll is online now OllBoll  Sweden
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Thanks and for the answer and now that I look at it I think you are right about the cap =)

You too,
Olle
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