2-way Audio Stereo Speaker Selector Switcher Box, Combiner Multi Zone A B Speaker Switch Distribution Controller Box - Home Theater Amplifiers - AliExpress
LYNEPAUAIO Audio Switcher RCA 2 in 1 Out / 1 in 2 Out AB Switch Stereo Audio Splitter Box with No Distortion RCA Jack for Switching Between Computer Speakers and Headphones - Walmart.com
A-B Audio Switching Box — AMERICAN RECORDER TECHNOLOGIES, INC.