Bass Rockers - 12 Inch Loud Competition Subwoofer - 4000W/ 2000W RMS - Max Program Power - Car Audio for Pro Car Stereo - Woofers Home Theater (4-ohms) - BRNK12v2 - Walmart.com
American Bass XMAXXX 15" 4000w RMS Subwoofer - 1800woofers.com
Massive Audio 10" Subwoofer 4000W 4 Ohm Pro Car Audio DVC HIPPOXL104 — Big Jeff Online Inc
Combo: HIPPOXL122 Subwoofer with E4 Nano Edge Bass Amplifier
Amazon.com: Banda 12" Car Audio Speaker Subwoofer - 4000W High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 4 Ohm, 220 oz Magnet, 3'' 4 Layer Voice
EXL XX 12" High Excursion Subwoofer 2000 Watts Rms DVC 4-Ohm