Audiopipe TSCAR15 15 inch Subwoofer - Single 4 ohm voice coil
JL Audio 15W0v3-4 W0v3 Series 15" 4-ohm subwoofer at Crutchfield
DC Audio Level 5 15 Inch M5 Elite Subwoofer - Best Price, Buy Online – Droppin HZ Car Audio
American Bass XFL 15 Inch 1000w RMS DVC Subwoofer - 1800woofers.com
Sundown Audio U 15" inch DVC Dual 4 Ohm (U Series) Car Subwoofer 1500 Watts RMS
JBL GTO1504D Grand Touring Series 15" subwoofer with dual 4-ohm voice coils at Crutchfield
15 Inch Subwoofers | MMATS Monster 15 1000 Watt RMS Car Subwoofer
15 Inch Car Subwoofer MMATS Juggernaut Car Subwoofer
BOSS Audio Systems P156DVC 15 inch Car Subwoofer – Phantom Series, 2500 Watts Maximum Power, Dual 4 Ohm Voice Coil, Sold Individually, Easy Mounting - Walmart.com
Sundown Audio Xv3 15" inch DVC Dual 1 Ohm (X Series) Car Subwoofer 2000 Watts RMS
KICKER 15VR DVC Large Powerful 15 Inch Subwoofer | Sub Woofer Speakers | Croooober