BAFFLE
Text: Baffle is an older term, though still used, for any loudspeaker housing. The main job of the baffle, or enclosure, is to keep the sound waves radiated by the rear of the loudspeaker cone from canceling the sound waves projected from the front. Since such cancellation occurs only at the lower frequencies, an unbaffled speaker invariably sounds bass-shy. For optimum performance, the enclosure must be acoustically matched to the loudspeaker it houses.
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Source: 103