Question

Sound waves produced at the back of a loudspeaker are________________________ degrees out of phase with respect to sound waves produced in front.

• A. 90
• B. 180
• C. 270
• D. 360

Hint:

Front and back sound waves of a speaker are 180° out of phase, causing potential cancellation without proper enclosure design.

Answer 1

The Correct Option is B

Sound waves produced at the back of a loudspeaker are 180 degrees out of phase with respect to the sound waves produced in front. This means that when the diaphragm of the loudspeaker moves forward producing a compression wave in front, it simultaneously produces a rarefaction wave at the back, and vice versa.
This phase difference causes the sound waves from the back and front to interfere destructively if not properly managed, which can reduce the overall sound output or cause cancellation of certain frequencies. That is why loudspeaker enclosures are designed to prevent this destructive interference and enhance sound quality.