DESC: Incredible bass, affordable price. Isnt that what all car audio nuts ask for? Polk Audio answers the call with their db series subwoofers. The db series is crammed with all of the patented technology that has propelled Polk Audio to the forefront of speaker design. The dish style polypropylene cone, utilizing a vented cone-to-coil coupler, is stiff yet lightweight for tight and controlled bass. Santoprene rubber surround is impervious to extremes in temperature, humidity and exposure to sunlight for excellent long-term reliability. High power handling is ensured by a 4-layer, high temp Kapton voice coil and triple vented motor assembly. Just like a drivers racing suite, the flat spider is made from fire-retardant Nomex® for controlled operation, especially at elevated listening levels. As with all Polk Audio subwoofers, the voice coil alignment, motor assembly, and suspension were optimized using a state-of-the-art Klippel laser analyzer.