Amazon.com: BOSS Audio Systems CUBE8 Car Subwoofer and Amp Package – Built-in Amplifier, 8 Inch Subwoofer with Passive Radiator, Remote Subwoofer Control : Electronics
Amazon.com: Rockville SBG1154 800 Watt Passive 4-Ohm Pro DJ Subwoofer, MDF/Pole Mount, 15 inch : Musical Instruments