Switching between two receivers — one set of speakers

I use Maple Tree audio.  He will make whatever switching combination you need.  I bought one that allows me to switch 3 sources between 2 amps, one set of speakers.  One is SS and one tube.  The switch has a built in load for the tube amp.  Well made. Solid. As far as the sub, I use a REL with the speakon connection so its always wired in to the speakers. I think other sub manufacturers have a similar connection. 

Thank you, gkelly — or thank you AI?

A custom switch by Maple Tree would be ideal. It could accommodate some additional switching as well. And the REL would be a nice upgrade to the Klipsch. 
I just don’t have that kind of budget right now. 
I may consider these kinds of upgrades once I’m happy with my overall setup, and aware of all desired switcheroo.

I’m no expert, but I’m about to do the same thing. My source will be Qobuz streaming through my Eversolo DMP A-8.  I have one amp (Primaluna EVO300 INT) connected to the Eversolo via the “rca out” and the other (Yamaha A-S3000) connected to the “balanced out”. Both amps will have speaker wires connected to my Cornwall IVs (2 sets of posts bridged). To compare the two amps, all I need to do is toggle between the audio out options on the Eversolo.  If my more experienced brethren here see anything here that risks blowing something up, please warn me.  Thanks!

DD