HIFI dual-channel audio signal switcher RCA high-end audio splitter Power amplifier manual switcher 4-1, 3-3 no need to plug in - AliExpress
Audiophile Dual Speaker Selector Switch Pine Tree Audio SPSX-2 Binding Posts USA | eBay
Amazon.com: SOLUPEAK U31 Premium RCA Switch Box, 3 in 1 Out Audio Switch, Stereo Switch Box with Signal Lossless, Sturdy Aluminum case Strong Anti-Interference, Compact Connector Distributor RCA Splitter Boxes : Electronics
RPA-MG1000
The Decware Zen Switchbox model ZSB
Meterk Linepaudio Audio Switcher 3.5Mm 2 In 1 Out / 1 In 2 Out A/B Switch Stereo Audio Splitter Box With No Distortion 3.5Mm Jack For Switching Between Computer Speakers And Headphones - Walmart.com
Got this Realistic Audio 42-2110 RCA switcher to switch the output from my DAC between Magni and Little Dot MKII amps. Great build quality. Couldn't find anything remotely close to this quality at local stores. Why did RadioShack go out of business again ...
Audiophile Switchbox
Amazon.com: 2-Way RCA Stereo Audio Switch Input Signal Source Switcher Selector Splitter Box(2 in 1 Out / 1 in 2 Out)-RC21 : Electronics