Amazon.com: JBL Club WS1000 10" Shallow Mount subwoofer w/SSI (Selectable Smart Impedance) Switch from 2 to 4 ohm Bundled with Alphasonik Earbuds : Electronics
MS-10SD4 SLIM | An advanced-design, shallow-mount, 4-ohm dual voice-coil subwoofer delivering phenomenal bass in a small space
JBL Club WS1000 10-in Shallow-Mount Subwoofer for Cars, Black - Walmart.com