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The Rockville W12K9D2 V3 is a 12-inch car subwoofer with a dual 2-ohm voice coil, rated 1000W RMS and 2000W program. The V3 adds a Punisher-series dustcap, an inner dustcap with an optimized pole vent, and a voice coil spacer to keep the coil cooler under sustained high power. It suits bassheads building loud daily systems or competition setups who want heavy power handling without flagship pricing. Against pricier name-brand subs it trades refinement and long-term resale for raw output and a stout double-stacked 190 oz magnet motor.
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Lowest price we've seen: $294.90 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
Owners of the K9 series describe strong output for the money and a stout motor, with the V3 cooling changes seen as a real durability gain. Complaints center on the box and power needed to get the most from it and on occasional unit-to-unit variation.
The W12K9D2 V3 is a 12-inch car subwoofer with dual 2-ohm voice coils. This version adds a Punisher-series polypropylene dustcap, an inner dustcap and a voice coil spacer over the V2. These changes are meant to keep the voice coil cooler during sustained high-power use.
It has a 3-inch, 4-layer voice coil wound with USA-made OFC wire on a black aluminum former, rated stable up to 240°C. The motor uses a double-stacked 190 oz magnet and a vented T-yoke, with an optimized pole vent for extra heat dissipation. The cone is non-pressed paper with red stitching reinforcement and a thick foam surround. The spider is Nomex, and the basket is cast aluminum with a black sanded finish.
The dual voice coils wire in parallel for 1 ohm or in series for 4 ohms. The subwoofer works in sealed or ported enclosures. A custom rubber boot magnet cover and a mounting gasket protect the magnet and seal the mounting.
