Amazon.com: BIC America WTR-Sys Wireless Transmitter/Receiver Kit for Hookup of Wireless Subwoofers and Wireless Powered Speakers, 8.30in. x 8.30in. x 2.20in. : Electronics
Multichannel Wireless Receiver for Making Subwoofers Wireless - Model 800, Compatible with Model 800 Transmitter, Connects to any Subwoofer and active Speaker, Better-than Bluetooth Digital Wireless - Walmart.com