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This bundle pairs two Rockville W8K9D4 8-inch dual 4-ohm subwoofers with a KRYPTON-M3 mono amplifier rated 1,000 watts RMS at 1 ohm, plus a dual 8-inch enclosure built for the 2009-and-up Ford F150 Super Crew, a box install kit and a 4-gauge amp wiring kit. It is a complete bass package for one specific truck, so the enclosure fit is the deciding factor. The subs are CEA-compliant and the amp is dyno-certified, which puts real numbers behind the claims. It suits F150 Super Crew owners who want a loud, low-cost bass build and are willing to install it themselves; rivals at this level usually sell the pieces separately and skip the truck-specific box.
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Owner feedback on Rockville K9 subs and KRYPTON amps is split: people praise the output for the money, while others report failures and overstated power. The truck-specific box draws little comment beyond fitment.
This bundle includes two Rockville W8K9D4 8-inch car audio subwoofers, a dual 8-inch enclosure made for 2009-and-newer Ford F150 Super Crew trucks, a Rockville KRYPTON-M3 mono amplifier, and wiring kits for installation.
Each subwoofer has a 2.5-inch 4-layer ASV voice coil wound with OFC wire, made in the USA. The coil is stable up to 200 degrees Celsius. The cone is black non-pressed paper with black stitched reinforcement, a thick foam surround and a polypropylene dust cap. The basket is cast aluminum with a black sanded finish. A vented hole on the T-yoke helps dissipate heat.
The magnet is a double-stacked 122 oz design with a rubber boot cover. A Rockville mounting gasket helps seal the subwoofer air-tight when mounted. The amplifier is a 1-ohm mono model with a remote.
