American Bass XMAXXX 15" 4000w RMS Subwoofer - 1800woofers.com
ATG Audio Transcend Series 15" DVC 4ohm Woofer
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
12'' Subwoofer 4000W RMS Car Audios - China Prosessional Spekaer, Car Speaker | Made-in-China.com
FBT Muse 218SN - 4000W Dual 18" Processed Bass Reflex Active Subwoofer with Infinito
Wholesale Audio Accessories 4000W 4Ohm PA Sound System Big Power 21 Inch Neo Subwoofer Active Speaker - AliExpress
2x American Bass 15" Subwoofer 4000W 3" 2 Ohm DVC Pro Car Audio XFL-15-D2 | eBay
Massive Audio 10" Subwoofer 4000W 4 Ohm Pro Car Audio DVC HIPPOXL104 — Big Jeff Online Inc