5+2/6+2 in 2+2 out audio source + amplifier + speaker multi-function switcher

RDL RU-ASX4DR 4x1 Stereo Balanced Audio Switcher/Terminal Block

4 Input Digital Audio Switcher with up to 680 ms Delay of Analog or Dolby I/O

DD740 Switcher bundled with an ADC and a Gefen DAC for Analog and Dolby I/O

Crestron DMPS3-300-C Digital HDMI Audio Video Matrix Switcher With Amplifiers

BZBGEAR 4x1 8K UHD HDMI 2.1 Switcher with Digial/Analog Audio De-Embedding/EDID

Broadcast Tools BC Tools 6 x 1 Switcher/Router with RM-1 Rack Mount

Vaux Lattis LE-800A 8x8 Audio Matrix Switcher, 8 inputs to 8 outputs, USED!