What's the source and what's the purpose. Usually can combine signals with a simple resistor matrix (each signal connects to a resistor which are joined together with another resistor to ground - the point where they come together is a mono signal. Drawback is if the first two resistors are too small - can affect the stereo separation (if it is still important) Second drawback would be lower signal level - but that is easy to adjust for. BTW, this is the most common method with most subwoofer amps. YMMV.
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