Amazon.com: Lanzar 6.5” Car Subwoofer Speaker - Black Non-Pressed Paper Cone, Aluminum Voice Coil, 4 Ohm Impedance, 600 Watt Power and Foam Edge Suspension for Vehicle Audio Stereo Sound System - MAXP64 : Electronics
Mb Quart Ps1-316 Premium 6.5 Inch 400 Watt 4 Ohms 3 Way Component Network Control Mobile Speaker Car Audio Systems, Grills Included, Black (2 Pack) : Target
Customer Reviews: Focal P 20 FSE Flax Evo Series shallow-mount 8" 4-ohm component subwoofer at Crutchfield
Dual 6.5" (D6) Speaker Pods for 2007-2009 GMC Sierra - Custom Speaker Pods
Gately - Alpha 6.5" V2 Subwoofer – Gately Audio
Sundown Audio SA 6.5" inch DVC Dual 2 Ohm (SA Series) Car Subwoofer 200 Watts RMS