JBL Stadium 122SSI Stadium Series 12" component subwoofer with switchable 2- or 4-ohm impedance at Crutchfield
JBL HDI 1200P 12" 1000W Powered Subwoofer Gloss Black JBLHDI1200PBLQAM - Best Buy
JBL Grand Touring Series GTO1204D 12" subwoofer with dual 4-ohm voice coils at Crutchfield
JBL BassPro 12 - 12 inch powered subwoofer enclosure - Amplified sub boxes - Online Car Audio & Stereo Store
JBL STAGE102 | 900W 10" Subwoofer with Ported Enclosure
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