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In a car which phenomenon, diffraction or the resonant frequency of the car, lends itself more to the ability of bass to go farther?

Related Answer: Why do bass tones travel through walls?

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Neither? The sound energy falls with the square of the distance so unless the car focuses the sound in a particular direction it'll only go as far as the the energy of the sound allows. –  Brandon Enright Jun 2 '13 at 2:07
Is the sound supposed to be heard inside or outside the car? –  fffred Jun 2 '13 at 7:00

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