15" CompC 4 Ohm SVC A thick stamped steel basket holds an injection-molded polypropylene cone with stabilizing ribs in the surround. Next-level engineering like this delivers clean, undistorted bass every time you turn it up! 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 12-Inch Subwoofer works best with a sealed or ported enclosure and 300 watts of recommended power. See below for more details. Specifications Size (IN.,CM) 15, 38 Impedance (OHMS) 4 SVC Max Rec Amplifier Power (WATTS PEAK/RMS)* 1200/600 Sensitivity (dB 1w/1m) 90.3 Frequency Response (Hz) 25-500 Mounting Depth (in, cm) 7, 17.7 Mounting Cutout (in, cm) 13-3/4, 35 Min Sealed Box Vol (cu. ft, L) 2.25, 63.7 Max Sealed Box Vol (cu. ft, L) 5.0, 141.6 Min Vented Box Vol (cu. ft, L) 3.0, 85 Max Vented Box Vol (cu. ft, L) 4.0, 113.3