Amazon.com: 15" Subwoofer 1000W Single 4 Ohm Bass Pro Car Audio American Bass DX-15 : Electronics
American Bass 12" Godfather Competition Subwoofer | 3000W RMS / 6000W Max | D1/D2
American Bass XR15 15 Inch 1200w RMS DVC Subwoofer - SSA STORE
Amazon.com: American Bass Usa XO 1044 600 Watt Max Dual 4Ohm 10 Inch Subwoofer, Black : Electronics
American Audio ELS15A Powered Speakers (2) with Stands & Covers | PSSL ProSound and Stage Lighting
Amazon.com: American Sound Connection 312H Universal Large Car Trunk Triple 12" Sealed Subwoofer Rear Angle 3 Sub Box Stereo Enclosure and S-W12D2 Type S Series Sub Dual 2 Ohm 1200W Peak 12"
PXW 15P Sub Woofer from American DJ for more punch in the bassline.