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In page Subwoofer:

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The heaviest production subwoofer intended for use in automobiles is the MTX Jackhammer by MTX Audio, which features a 22-inch (560 mm) diameter cone. 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.[1] The Jackhammer has been featured on the reality TV show Pimp My Ride.[citation needed]