12" Series II Car Audio Subwoofer Power Handling: Peak: 1100 watts RMS: 275 watts Recommended power range: 150 - 350 watts RMS Nominal Impedance: Single 2 or 4 ohm Polypropylene Cone Nitrile Butadiene Rubber (NBR) Surround SSITM (Selectable Smart Impedance) Oversized 2.0" Voice Coil Spade Quck-connect Terminals Stamped Steel Basket Frame Top-mount depth: 6-1/2" Cutout diameter: 11-1/4" Frequency Response: 25 ~ 175 Hz