Is connecting two Amps to one set of speakers for A/B testing safe?

[antennaguru]

Yeah, I know -- I was going to put a 4PDT switch image, but I saw that one, reflected upon it for a moment, and thought -- meh, good enough!

I actually have one of those exact switches to turn on the 240VAC input of 30A 48VDC SMPS, and it works great. Just a giant knife switch...

 

[MakeMineVinyl]

Just. Because.

 

[Zek]

Just. Because.

View attachment 174487

You have to wear rubber gloves, rubber boots and rubber underpants - just in case ...