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
BOSS Audio Systems P156DVC Phantom Series 15 Inch Car Audio Subwoofer – 2500 Watts Max, Dual 4 Ohm Voice Coil, Sold Individually, For Truck Boxes and Enclosures, Hook Up To Amplifier
Best Buy: Hifonics Alpha 15" Dual-Voice-Coil 8-Ohm Subwoofer Blue/Black HAW15D4
Amazon.com: Hifonics BRW15D4 3000 Watts 15 Inch Brutus Car Audio Subwoofer with Heavy Gauge, Powder Coated, Aluminum Die-Cast Basket, Dual 70 Oz Magnet, 3 Inches Voice Coil - Dual 4 Ohm - 15 in : Electronics
Titan 15" Subwoofer | Car Audio Equipment | American Bass
15 inch Eminence Professional Series Replacement Speaker – Eminence Speaker, LLC