NVX VCW154: 15" 1000w RMS Car Subwoofer, Dual 4 Ohm
Amazon.com: Pyle 10" Car Audio Speaker Subwoofer - 1000 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 90 dB, 4 Ohm, 50 oz Magnet, 2
2) JBL PRX908 8" 1000w RMS Powered DJ PA Speakers+18" Subwoofers+Pole Mounts - Rockville Audio