Kicker 40CWD104 compD 10" inch 25cm 250mm 600 Watt Sub Subwoofer 4ohms  Built to Pound Hard! CompD Subwoofers are ideal for vented or sealed enclosures, or even in free-air applications, and handle more power than any previous Comp Series generation. Each is equipped with a lightweight, injection-molded polypropylene cone and tough, ribbed polyurethane surround for eliminating flex and distortion. The heavy-duty motor structure includes a rip-resistant, large-diameter spider that supplies less flex, longer life and better accuracy. High-strength Spiralead™ tinsel leads weave through the large spider for max signal transfer. High-temp coil wire winding around a vented pole piece and innovative Quad Venting™ slots contribute to the woofers' efficient cooling attributes and durability. Basket Tech Its full-coverage, steel basket is shallower than previous Comp baskets, fitting into more applications, and it incorporates 1/4-inch, heavy-duty spade connections. Size (IN.,CM) 10, 25 Impedance (OHMS) 4 DVC Max Rec Amplifier Power (WATTS PEAK/RMS)* 600/300 Sensitivity (dB 1w/1m) 86.2 Mounting Depth (in, cm) 4-13/16, 12.2 Mounting Diameter (in, cm) 9-1/8, 23.1 Min Sealed Box Vol (cu. ft, L) 1.0, 28.3 Max Sealed Box Vol (cu. ft, L) 2.4, 68 Min Vented Box Vol (cu. ft, L) 1.25, 35.4 Max Vented Box Vol (cu. ft, L) 1.75, 49.6