Polk Audio -Two DB842SVC 8" Single 4-Ohm Voice Coil Subwoofers, Bundle - Marine Certified Everything you love about Polk’s Dynamic Balance technology—that rich, clean, full-range sound—is built into the marine-tough, yet ruggedly sophisticated, DB+ series. And with its universal fit, it can be installed in any vehicle: Automobiles, motorcycles, boats, ATVs—you name it. Specifications: • Cutout Diameter - 7.28" (18.49 cm) • Full-Range Mounting Depth - Top Mount 3.82" (9.
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