Amazon.com: Focal Sub P 25 FS 10" Shallow 4-ohm Component Subwoofer : Electronics
Amazon.com: Frisby FS-2700B USB Powered 2.1 Ch PC Computer Desktop Notebook Tablet Laptop Woofer Speaker System for Home or Office Consumer - Blue : Electronics
FS Compact Powered Subwoofer – SKAAstore™
Amazon.com: Focal Sub P 25 FS 10" Shallow 4-ohm Component Subwoofer : Electronics
FS: 12" Acoustic Elegance Lambda Woofer Driver PB12 w Copper Faraday Rings Single Woofer 150$ OBO | AVS Forum
Frisby FS-6200BT Bluetooth Wireless 2.1 CH Media Subwoofer Speaker System w/ Remote (3-Piece) - Walmart.com