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baffle
a deflector plate in a loudspeaker used to eliminate the out-of-phase sound waves from the rear of the loudspeaker

Banana plug
A single-wire electrical connector used for joining wires to equipment

Bandpass
A device that passes frequencies within a certain range, rejecting any frequency outside of that range

bass reflex cabinet
A speaker enclosure that uses the sound from the rear side of the diaphragm to increase the efficiency of the system at low frequencies

Bi-amp
Using two amplifier channels to power a loudspeaker with multiple drivers

bi-wire
A single cable with two conductors connects an amplifier to a loudspeaker

Binding post
A connector used to attach a single wire

bipolar
The design of bipolar speakers is made to have two or more drivers producing sound in multiple directions, making the surround sound field wider so the sound location cannot be identified.

Bipole
Surround speakers that have two or more speakers that output sound from both sides of the cabinet

Bookshelf speaker
A compact loudspeaker intended to be placed on a raised surface