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Standing waves

When a sustained tone is emitted in an enclosure (room, automobile, speaker cabinet) consisting of parallel walls, a standing wave train is set up. Standing waves are created when two wave trains, moving in opposite directions, interfere. When a reflected wave reinforces a rarefaction of the original waveform, the sound waves reinforce themselves, thus increasing the amplitude. Due to size limitations, automobile interiors can not sustain standing waves in the low frequency spectrum.

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