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
Car & Marine | Harman Audio
MS-10SD4 Slim - JBL 10" Dual 500W RMS 1000W Max 4-Ohm Slim Series Subwoofer