Amazon.com: Gravity Car Vehicle Subwoofer Audio Speaker - 15 Inch Competition Grade Pressed Paper Cone, 2 Ohm DVC, Advanced Air Flow, 4800W Power for Stereo Sound System Warzone G715D2 (1 Subwoofer) : Electronics
DS18 HOOL-X15.2DSPL HOOLIGAN X 15" Competition Subwoofer 6000 Watts MAX 4" DVC 2-Ohms
Amazon.com: American Bass 15" Competition Car Subwoofer, 3000 Watt Maximum Power, Bass Surround Speaker, Car Audio Stereo Subwoofer - 15 inch, Dual 4 Ohm Voice Coil : Electronics
Amazon.com: Gravity Car Vehicle Subwoofer Audio Speaker - 15 Inch Competition Grade Pressed Paper Cone, 2 Ohm DVC, Advanced Air Flow, 3500W Power for Stereo Sound System Warzone GW15D2 (1 Subwoofer) : Electronics
15 Inch Car Subwoofer MMATS Juggernaut Car Subwoofer
15" COMPETITION SERIES SUBWOOFER 4000WMAX – GENIUS AUDIO USA
15" Competition grade Hand Built Subwoofer 8000rms (Super Team) - EM Audio Subwoofers