woofer -
a loudspeaker that reproduces lower audio frequency sounds
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Wiktionary
Substantiv
woofer -
An electronic speaker that produces low-frequency sound.
Wikipedia
Woofer is the term commonly used for a loudspeaker driver designed to produce low frequency sounds, typically from around 40 hertz up to about a kilohertz or higher. The name is from the onomatopoeic English word for a dog's bark, "woof" (in contrast to the name used for speakers designed to reproduce high-frequency sounds, tweeter). The most common design for a woofer is the electrodynamic driver, which typically uses a stiff paper cone, driven by a voice coil which is surrounded by a magnetic field.
