JBL ES150PWBK Wireless 300-Watt Powered 10-inch Subwoofer (Black) (Discontinued by Manufacturer) The JBL 150PWBK is a powerful 300 Watt RMS 10-inch powered subwoofer that does not require a wire to run between the source and the subwoofer This version is in black. This works on 120 Voltage.