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A 7.5 cm diameter dual voice coil from a subwoofer driver. A voice coil (consisting of a former, collar, and winding) is the coil of wire attached to the apex of a loudspeaker cone. It provides the motive force to the cone by the reaction of a magnetic field to the current passing through it.
The electroacoustic mechanism most widely used in speakers to convert the electric current to sound waves is the dynamic or electrodynamic driver, invented in 1925 by Edward W. Kellogg and Chester W. Rice, which creates sound with a coil of wire called a voice coil suspended between the poles of a magnet.
Subwoofer: 5.25" Dual voice coil active woofer, 6" wOOx passive radiator; Left/Right Speakers: 3" full range, magnetically shielded; Power supply (subwoofer only): AC 110-220 V, 50–60 Hz, 310 mA @ 220 V; Electronic crossover frequency (subwoofer to a speaker): 160 Hz; Electronic crossover filter slopes: Subwoofer: -18 dB/octave at 160 Hz
The Jackhammer has been known to take upwards of 6000 watts sent to a dual voice coil moving within a 900-ounce (26 kg) strontium ferrite magnet. The Jackhammer weighs in at 369 pounds (167 kg) and has an aluminum heat sink. [129] The Jackhammer has been featured on the reality TV show Pimp My Ride. [citation needed]
Voice-coil wire cross sections can be circular, rectangular, or hexagonal, giving varying amounts of wire volume coverage in the magnetic gap space. The coil is oriented co-axially inside the gap; it moves back and forth within a small circular volume (a hole, slot, or groove) in the magnetic structure.
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It was a powered speaker system that offered stereo, Dolby Pro-Logic and AC3 surround sound from the soundbar and a separate subwoofer. The soundbar contained four 3-inch full range drivers and two 1-inch tweeters while the subwoofer housed one 8-inch dual voice coil driver.
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