Amazon.com: Gravity Car Vehicle Subwoofer Audio Speaker - 15 Inch Competition Grade Pressed Paper Cone, 2 Ohm DVC, Advanced Air Flow, 7000W Power for Stereo Sound System Warzone GW15D2 (2 Subwoofers) : Electronics
Amazon.com: Peavey 15LOMAX 15" Lo Max Subwoofer : Electronics
Amazon.com: PYLE-PRO 15 Inch Car Midbass Woofer -800 Watt High Powered Car Audio Sound Component Speaker System w/High-Temperature Kapton Voice Coil, 30Hz-3kHz Frequency,90.2 dB, 8 Ohm, 70 oz Magnet PPA15 , BLACK :