KICKER 48CWR84 CompR 600 Watt 8" Subwoofer DVC 4-ohm Car Audio Sub CWR8-4 COMPR8 713034019152 | eBay
Amazon.com: Lanzar 8in Car Subwoofer Speaker - Black Non-Pressed Paper Cone, Stamped Steel Basket, 4 Ohm Impedance, 600 Watt Power and Rubber Suspension for Vehicle Audio Stereo Sound System - MAX8 (1 pack) : Electronics
FBT Subline 112 SA - 12" 600W Compact Band-Pass Active Subwoofer
Renegade RXW124 Subwoofer 30cm With 600 Watt, 4 Ohm, Sub 12 " 4251476406223 | eBay
Pyle Pltab122 12 Inch 600 Watt Enclosed Carpeted Cylindrical Tube Vehicle Car Audio Subwoofer Speaker Sound System With Built In Amplifier : Target
Blaupunkt 10" Single Voice Coil Subwoofer with 600W Power (GBW101) - Walmart.com