Web Definition: Subwoofer
A subwoofer is a loudspeaker device which reproduces sub- bass frequencies below about 60-150 Hertz, where the feeling of punch & energy tends to be located in music & movie soundtracks. It is difficult for small loudspeakers to produce these frequencies, particularly at high output levels & so it is often advantageous to use a separate speaker dedicated to this task. The need to reproduce these frequencies has increased since older formats, such as vinyl records, have been displaced by digital formats, such as CD & particularly 5,1 formats such as Dolby Digital, in which the .1 channel is dedicated solely to the subwoofer. The .1 channel is usually dedicated to extended bass frequencies, for example, the low frequencies of a gunshot, string bass, or thunder. This track is often used aggressively by mixing artists. Subwoofers use drivers with cones typically coming in 10 or 12 sizes, but can be as large as 34 & as small as 4. Width tends to be advantageous because low frequencies involve shifting a great deal of air; a recent trend has been for high excursion, i .e.
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