JBL SRX828SP 2000W Dual 18 inch Powered Subwoofer | Sweetwater
JBL Stadium 102SSI Stadium Series 10" component subwoofer with switchable 2- or 4-ohm impedance at Crutchfield
MTX TNE212DV 12-Inch 2000-Watt Max Car Audio Dual Loaded Subwoofer Box Enclosure - Newegg.com
JBL SRX828SP | 18" Dual Self-Powered Subwoofer System
Amazon.com: JBL SUBBP12AM - 450 Watts (150W RMS) 12” Amplified 12 in. Ported Subwoofer with Sub Level Control and Distortion Free Bass with Gravity Magnet Phone Holder Bundle : Electronics