This is a simple enclosure to hold 3 4-way loudspeaker connectors and a toggle switch to provide a 2 in 1 out stereo switch to connect 2 audio amplifiers to one set of speakers. It can also be used to switch 1 amplifier between 2 sets of speakers.

In my case I am using this to allow switching between a surround sound amplifier and a bluetooth amplifier connected to an Echo Dot driving the rear surround speakers.

The SCAD file allows for printing the base, lid and an optional mounting plate. The plate is just a flat sheet attached to the switch so that I can hang the enclosure behind a piece f furniture and only the switch is visible.

There is enough room in the enclosure to put in a pair of miniature DPDT relays instead of the toggle switch if one wanted to make it remote controlled.