Amazon.com: ASC Single 18" Subwoofer 1" MDF Universal Fit Vented Port Sub Box Speaker Enclosure : Electronics
TXX-BDC4-18 Subwoofer Quad Stack
5 Core FR-18-190-AL Subwoofer Audio Speaker- 18 inch Paper Cone, 8 Ohm Impedance, 850W PMPO, RMS is 500W for Car, DJ, Home Audio- FR 18 190 AL
Dayton Audio 18" Reference Series HO Subwoofer and Cabinet Bundle 900 Watts
Blast King PROFILE18 18" 3000 Watts Peak Power Woofer, Part #PROFILE18 - Speaker Exchange
Yamaha DXS18XLF 1600W 18 inch Powered Subwoofer | Sweetwater
Amazon.com: JBL Professional ASB6128 Dual High-Power 18-Inch Subwoofer System, Black : Electronics
18 Inch Powered Subwoofer Bass Cabinet - 500 Watts RMS | Powered 18 Inch Sub Cab | Powered 18 Inch sub woofer | Powered 18 sub | Power | Active 18 Inch Subwoofer Cabinet | 18 Inch Active Sub | Active – Seismic Audio
BassBoss SSP218-MK3 Dual 18-Inch Two-Way Active Powered Subwoofer — Chuck Levin's Washington Music Center
Induction Dynamics - SW2 - 18" Subwoofer
QSC KS118 3600W 18 inch Powered Subwoofer | Sweetwater
Yorkville ES18P Active Elite Series 18" Powered Subwoofer 3200W
EM-1krms - EM Audio 18" Custom Hand Built Subwoofer (1000 watts) - EM Audio Subwoofers