Focal Sub 10 Slim 10" Shallow Mount Subwoofer, Single 4-ohm, 230w Rms - 460 W Max : Target
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