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JBL Stadium 122SSI Stadium Series 12" component subwoofer with switchable 2- or 4-ohm impedance at Crutchfield
Amazon.com: JBL Club WS1200 12" Shallow Mount subwoofer w/SSI (Selectable Smart Impedance) Switch from 2 to 4 ohm Bundled with Alphasonik Earbuds : Electronics
JBL Stage 1210 Subwoofer | 12" (300mm) woofer with 250 RMS and 1000W peak power handling.
JBL BassPro 12" Subwoofer - CAR TUNES STEREO
JBL HDI 1200P 12" 1000W Powered Subwoofer Gloss Black JBLHDI1200PBLQAM - Best Buy