Amazon.com: Lanzar 8 inch Car Subwoofer Speaker - Black Non-Pressed Paper Cone, Aluminum Voice Coil, 4 Ohm Impedance, 800 Watt Power and Foam Edge Suspension for Vehicle Audio Stereo Sound System - MAXP84 : Electronics
Diamond Audio Speakers for Cars - OnlineCarStereo.com
Kicker CWS15 Car Audio CompC Subwoofer Single 4 Ohm 15" Sub 44CWCS154 Brand New - Walmart.com
B&C 18TBW100-4 18" Professional Subwoofer 3000W 4-Ohm High Power Car Audio Sub. | Reverb
Power Acoustik CBW-124 12" 12 inch Dual 4 ohm Car Audio Subwoofer 1500W MAX | eBay
Nemesis Audio NEO-8COL 8" 800 Watts Max 4-Ohms Car Audio Midrange Spea – Audiocon
ASB6112 4000W 12-inch Passive Subwoofer - Black - Sweetwater
Planet Audio TQ12S Torque Single 12" 1500 Watt 4 Ohm Power Car Stereo Subwoofer - Walmart.com