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The typical frequency range that is covered by a subwoofer is about 20–200 Hz for consumer products, [1] below 100 Hz for professional live sound, [2] and below 80 Hz in THX -certified systems. [3]
A rotary woofer is a subwoofer -style loudspeaker which reproduces very low frequency content by using a conventional speaker voice coil 's motion to change the pitch (angle) of the blades of an impeller rotating at a constant speed.
The low-frequency effects (LFE) channel is a band-limited audio track that is used for reproducing deep and intense low-frequency sounds in the 3–120 Hz frequency range. This track is normally sent to a subwoofer—a loudspeaker designed to reproduce very low frequencies.
In music, acoustic waveguide methods, such as a large pipe organ or, for reproduction, exotic loudspeaker designs such as transmission line, rotary woofer, or traditional subwoofer designs can produce low-frequency sounds, including near-infrasound. Subwoofers designed to produce infrasound are capable of sound reproduction an octave or more ...
Since the 1990s, a type of woofer which is designed for very low frequencies only, the subwoofer, has come to be commonly used in home theater systems and PA systems to augment the bass response; subwoofers usually handle the very lowest two or three octaves (i.e., from as low as 20 to 80 or 120 Hz).
Enclosures used for woofers and subwoofers can be adequately modeled in the low-frequency region (approximately 100–200 Hz and below) using acoustics and the lumped component models. Electrical filter theory has been used with considerable success for some enclosure types.