From power Amplifier 2

is it possible to accidentally damage speakers or power amplifier by plugging positive wire into negative port or vice versa.
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  1. If you're talking about reversing the polarity of the speaker wire, no damage will occur but in a stereo pair the sound will be out of phase, giving strangely stretched image.

    If in doubt about polarity, put the two speakers opposite each other about a couple of inches apart and if it's reversed (out of phase) bass is greatly reduced due to cancelling effect.
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