S-20 2.1 Mini Black 3W Wooden Subwoofer Portable Music USB Computer Speaker for Desktop / TV / PC / Smartphone
Eton Active Subwoofer USB 8 – Far Corners
NJSJ PC Speakers with Subwoofer,USB-Powered Mini 2.1 Stereo Multimedia Speaker System with RGB Gaming LED Light up Wired 3.5mm Audio for Computer Laptop Monitor,Tablets,Music Player,11W : Amazon.co.uk: Computers & Accessories
Compact 2.1 Subwoofer Usb Speaker Set 12w, 3.5 Mm, Usb Power Supply | Fruugo SK
Amazon.com: Soundstream USB-10P 10 Inch Underseat Enclosed Car Vehicle Subwoofer with Built In 150 Watt RMS Amplifier and Bass Knob Remote Control, Black : Electronics