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Best Choice New In Phase Car Audio USW300 300W Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium (Pack of 1) Rich powerful base - With a built in amplifier, max output of 300 W and 130 W RMS, the In Phase USW300 is a true pocketNew ISUDAR SU6901 Car Underseat Active Subwoofer Built in Amplifier, Car HiFi Slim Enclosed Subwoofer System (150 Watt 6 * 9 Car Subwoofer Built In Amplifier: Producing 150 Watts of strong, rich, deep bass that you can feel.New Caliber BC108US 8-Inch Enclosed Active Underseat Car Stereo Subwoofer System - Black UnderseatNew JVC CS-BW 120 Car Subwoofer & VIBE Audio Slick 2000 W System Car Wiring Kit Product 1: 30 cm subwoofer cabinet with a maximum capacity of 1300 W/150 W RMS.Best Value New VIBE Car Audio Car Audio 240W Pulse PULSEC8A-V0 Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium COMPACT DESIGN - The high excursion 6x8” slim subwoofer enclosure will give you added bass when you have no space. The sNew Echo Sub | Powerful subwoofer for your Echo—requires compatible Echo device and compatible music streaming service Echo Sub delivers down-firing, 100W deep bass sound through a 6" woofer.New TAPMING Car Audio Car Underseat Active Subwoofer Built in Amplifier Slim Enclosed Subwoofer System 600 Watt 8" Car power 600w Bass, the 68mm Thin Subwoofer Is Directly Installed Under the Passenger SeatNew In Phase USW12 Car Audio 600W 12" Underseat Ultra Slim Compact Active Subwoofer System, Die-Cast Aluminium ALUMINIUM CONED SUBWOOFER - With a built in amplifier powering an aluminium coned subwoofer and a max output of 300W, thNew Pioneer TS-A300D4 30 cm 4Ω enclosure-type dual voice coil subwoofer (1500W) 12" (30cm) SubwooferNew Wharfedale Diamond SW150 Subwoofer Black PERFOMANCE IN ITS CLASS: Wharfedale SW-150 Subwoofer is a quality piece of budget equipment which delivers perfect power