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Enclosures

A loudspeaker is commonly mounted in an enclosure (or cabinet). The major role of the enclosure is to prevent the out-of-phase sound waves from the rear of the speaker combining with the positive phase sound waves from the front of the speaker, which would result in interference patterns, and cancellation of the low frequencies where the wavelengths are large enough that, in comparison, the front and rear of the speaker driver do not significantly differ in location. The "ideal" technique would be to mount the driver in a divider which extended to infinite distance in all directions to prevent the "back wave" from ever reaching the listener; because it's an attempt to simulate such behavior, the typical simple sealed box speaker system is known as an infinite baffle, although it is not actually infinite in size. More sophisticated designs attempt to improve on the performance of this design.

 
 
 

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