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
Amazon.com: YMOO 2.4Ghz Wireless Audio Transmitter Receiver for TV,192kHz/24bit HiFi Audio,20ms Ultra Low Latency,320ft Long Range RCA Jack Wireless Adapter for Active Subwoofer/Speaker from TV/PC/Party/Game/Home : Electronics
Amazon.com: Multichannel Wireless Audio Transmitter for Making Surround Speakers Wireless - Model 800, Transmits 4 Audio Channels, 300' Range, Connects to Any Audio Source, Better-Than Bluetooth Digital Wireless : Electronics
Amazon.com: KEF LSX II Wireless HiFi Speaker System (Carbon Black) & KW1 Wireless Subwoofer Adapter Kit, KW1TXRX : Electronics