5.1 to 4.0 audio mixer

To listen to 5.1 sound on my 4.0 system I made a small TL074 based down-mixer. This added the center channel to the two front channels and added the sub channel to all four full range speakers.

The potentiometers control the sub and center volume, the switch turns the whole on and off. The only downside was that the unit required ±12V, so I used an old computer PSU to provide the +12V and -12V.

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