Roku Wireless Subwoofer |Add bass to your Roku audio | Buy now at Roku.com | Roku
Bose Bass Module 500 Wireless Subwoofer - Black | P.C. Richard & Son
One unit (not pair) |15 Inch Woofer for Bass Compensation of Open Baffle or Cabinet | W-15 - Lii Audio, unique speaker, amplfier, quality and cost-saving parts for HiFi DIY