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.
Switching between two receivers — one set of speakers
Is there a way to have one pair of main speakers plus one sub (the latter currently fed via the pre of a one of the receivers), and switch between two receivers using the same mains/sub (without rewiring each time)?
Yamaha R-2000
Nikko 1219
KEF Q500
Klipsch 12” sub