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: Pyle 12' Car Audio Speaker Subwoofer - 1600 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 90 dB, 40 Ohm, 60 oz Magnet, 2
Amazon.com: Audiopipe Woofer - 700 W Rms - 1400 W Pmpo - 1 Pack - 25 Hz To 1.20 Khz - 4 Ohm - 90 Db Sensitivity - 15 Woofer - Automobile : Electronics
Amazon.com: Memphis Audio MJP1544 15" 1500 Watt MOJO Car Subwoofer Bundle with Rockville dB13 Mono 2 Ohm Amplifier Car Amp & Rockville RWK41 4 Gauge Complete Car Amp Wiring Installation Wire Kit (3 Items)