Best Buy: Sonance Automatic Line-Level Selector Black AL2
Audio & Video Cables - Aliexpress
6 Zone dual source automatic impedance matching speaker selector with individual volume control - Simple to install and operate 6-channel speaker selector A/B speaker selector Audio power handling: 100 Watts/Channel (peak) Frequency
Automatic Video Switch Clear Blue VR-2 RCA Audio Video Switch | eBay
Audio Authority 1177A-1 Digital Audio Switch / Digital Audio Switcher
Amazon.com: OSD Audio 7-Zone Automatic Speaker Selector – Dual Source and Remote Control – ATM7 : Electronics
Amazon.com: LVY RCA Audio Selector, 2-Way RCA Stereo Audio Switcher Splitter Selector Box Audio Sharing Compatible with RL Audio Equipment Such as Speakers and TVs ect. : Electronics
4 Zone Channel Speaker Switch Selector 4 Way Av Rca Stereo Audio Switch Distribution Controller Box Hub For Amplifier - Buy 4 Zone Channel Speaker Switch Selector 4 Way Av Rca Stereo
50-8395 - Multicomp Pro - Switch, Automatic, Speaker/Line Level