JBL Stage 12" 4 ohm Subwoofer Sub STAGE1210 1000W Peak 250 RMS Single Voice Coil 50036357166 | eBay
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