Baffle
Baffle A solid surface surrounding a driver in a loudspeaker. The lower the frequency of the sound produced by the vibrating cone of a driver, the more apt it is to simply cause air to rush from one side of the cone to the other, rather than produce the compression waves that constitute sound. By adding a baffle around the driver, this increases the length of the path that air must travel, lowering the frequency at which this destructive interference takes place. In most loudspeakers, the enclosure forms a baffle. In the case of infinite baffle enclosures, the enclosure is sealed (thus 'infinite') while with bass reflex speakers a port is carefully tuned to allow energy from the back of the cone to supplement that from the front at selected bass frequencies. Put simply, the baffle is the front panel of the loudspeaker.
Source: http://www.astintrew.co.uk/support/The%20Astin%20Trew%20Dictionary%20of%20Hi-Fi%20Terms%202008.pdf
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