8" CompC 4 Ohm SVC CompC Subwoofers are equipped with stamped steel frame construction, inheriting elite innovations for world-class KICKER power, durability and hard-hitting, high-performance bass. Features: Four-Ohm Voice Coil Injection-Molded Polypropylene Cone Perimeter Venting for Thermal Management Ribbed Polyurethane Surround Signature Yellow Surround Stitching High-Strength Spiralead Tinsel Leads Stamped Steel Basket High Temp Voice Coil Spring-Loaded Speaker Terminals *The CompC 8-Inch Subwoofer works best with a sealed or ported enclosure and 200 watts of recommended power. See below for more details. Specifications Size (IN.,CM) 8, 20 Impedance (OHMS) 4 SVC Max Rec Amplifier Power (WATTS PEAK/RMS)* 400/200 Sensitivity (dB 1w/1m) 85.6 Mounting Depth (in, cm) 3-7/8, 9.8 Mounting Diameter (in, cm) 7, 17.7 Min Sealed Box Vol (cu. ft, L) 0.5, 14.2 Max Sealed Box Vol (cu. ft, L) 1.2, 34 Min Vented Box Vol (cu. ft, L) 0.66, 18.7 Max Vented Box Vol (cu. ft, L) 1.2, 34