Stereo channel & polarity test
Check left/right assignment and speaker polarity with pink noise.
Check that the left signal comes from the left speaker. For polarity: play "in phase", then "out of phase". When both speakers are wired correctly, the out-of-phase version sounds thin, diffuse and short on bass. If it sounds fuller than the in-phase version, one speaker is wired backwards.
How it works
Identify which speaker is left and which is right, and detect speakers wired with reversed polarity. Reversed polarity cancels bass where the speakers overlap, so the sound becomes thin and hard to localise.
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