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
2-Way Stereo Speaker Switch with Volume Control | Audio Volt — Audio Volt
Amazon.com: Pyle 6 Channel Speaker Selector Switch - Multi Zone A B Speaker Distribution Controller Box w/ Independent Audio Source Volume Control, Supports Home Theater Stereo Receiver System - Pyle PSLSW6 : Electronics
Speaker Selectors with Volume Controls
Sonance SS4VC 4-Pair Stereo Speaker Selector with Volume Controls (Each) Black 91931 - Best Buy
How to Use A Speaker Selector for Multi-Room Audio | Audioholics