For Bass Reflex we have terms and definitions in 2 topics. The topics are Home Theater and Television.

A vented loudspeaker enclosure in which the rear waves from the woofer(s) emerge through an opening or bass reflex port that is tuned to the woofer characteristics. A correctly designed bass reflex enclosure may feature higher efficiency and/or deeper bass than e.g. an acoustic suspension cabinet.
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Speaker cabinet with an opening relieving air pressure behind the woofer and allowing sound waves generated behind the woofer to contribute to the overall output, but with partitions or barriers inside lengthening the travel path of escaping sound waves so they emerge more in phase with sound waves from the front of the woofer.
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