Amazon.com: CT Sounds Hydro 12 Inch Car Subwoofer 600w RMS Dual 4 Ohm : Electronics
BOSS Audio Systems BE8D Elite Series 8 Inch Car Audio Subwoofer - 600 Watts Max, Dual 4 Ohm Voice Coil, For Truck Boxes and Enclosures, Hook Up To Amplifier
Discontinued Obsolete SKU | MTX Audio - Serious About Sound®
ALPINE S-W12D2 TYPE S 600RMS 12INCH DUAL 2OHM SUBWOOFER*great quality sub*
Sundown Audio U 8" inch DVC Dual 4 Ohm (U Series) Car Subwoofer 600 Watts RMS
DD Audio REDLINE 600 Series Subwoofers | Explicit Customs