I have a two channel audio output device for PC. For some reason one of them is broken down. So, I have logically an one channel audio output device. Can I still use it to hear sound outputs belonged to all frequencies from PC by shorting left and right channel wires and feeding it to the working speaker? The sound quality may be degraded that way.

My circuit diagram elaborates it. enter image description here

enter image description here

  • It's not actually 'shorted', it's known as Bridged Mono. So long as the impedances are still within tolerance, nothing untoward will happen.
    – Tetsujin
    Commented Dec 22, 2015 at 13:20
  • Will it degrade the sound quality?@Tetsujin Commented Dec 22, 2015 at 13:29
  • Well, yes, it'll be in mono, not stereo. It's not clear from your post whether it's the output or one speaker that's broken. Text makes me think output, picture makes me think one speaker. If it's the output, it won't be any improvement at all.
    – Tetsujin
    Commented Dec 22, 2015 at 13:44
  • Sorry for the confusion, it is the left channel speaker(the right one is broken down.), not the output.@Tetsujin Commented Dec 22, 2015 at 13:54
  • I thought bridged mono was something very different? Also, wouldn't this cause any out-of-phase content present in both channels to disappear? Commented Jan 8, 2016 at 15:53

1 Answer 1


Yes you can, the stereo signal is just two fast changing voltages and a ground signal and it's totally industry standard plug compatibility for mono stereo jacks to fit suitable speakers.

You can add the two voltages because they have mostly have the same phases of amplitude for most music, with dual mic recordings logically you can get some small phase cancellation effects in certain bass notes if the mics were positioned so that a particular wavelength arrives with inversed phase at either microphone, it's practically unnoticeable, especially in higher frequencies.

Alot of music is made stereo on a mixing desk in so there won't be much phase cancellation.

You will lose the stereo information but all the sound information will still be in the mono signal.

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