Ways to sum stereo to mono before the power amplifier?

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But if they have resistors on the outputs then shorting them should be fine.

Hi,

No. the protection resistors are a few hundred ohms, typically say 200R.

Most op-amps will distort on stereo stuff if you connect them together directly.

It will work but its very poor practise. You need a passive mixer as described.

Generally all stereo outputs cannot support the resulting current
of tying two outputs directly together. Its just a very bad idea.

If you want to know how bad, try it with amplifier outputs.

rgds, sreten.

FWIW a headphone output, heavily attenuated from an
amplifiers output, is one case that will support shorting.
 
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