>>when we have multiple amplifiers  (Tube amplifier, digital power amplifier, headphone amplifier,Active speakers..) 
 
>>sometimes it is a little inconvenient by plugging and un-plugging cables between multiple different devices
 
this box helps to switch input channel easily.
 

This is a compact RCA cable switcher Box, with 4-ways audio source input, one output (4 in 1 out) or 1 source input 4 output to amp/headphone amp/active speakers (1 in 4 out) 4 outputs are not simultaneously

 
The switcher design with relay control, it has the following advantages: 
>>lossless sound quality, no affected sound
>>durable and reliable
>>protect the output device
>>smooth seamless switching, better listening
>>it can switch easily,you can enjoy the sound quality perfectly
>>It has no signal amplification function,just switching signal source
>>gold-plated RCA port, like the picture, not a cheap RCA port
>>aluminum shell, the thickness of the front panel is 6mm, the thickness of the rear panel is 3mm, solid and reliable