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Old 03-14-2003 | 04:05 AM
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Unstable
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From: Franklin Park, NJ
Default Radio interference off of a building?

same thing happens with sound waves.

if you want to try it get two subwoofers and hook them up right next to each other.

now play a nice low note.

now reverse the polarity on one sub and play the same note.

it will be a whole lot quieter due to the reversed sound waves canceling each other out.

also it is possible to bounce sound off a wall and get this effect buy harder to predict and "tune" .