I run two amps in my setup - a Rachel and a Rogue Pharaoh.  I was getting tired of having to swap the speaker leads between amps, so I asked Steve if they had a solution and he said to give 20-amp light switches a try.  Well, it worked out quite nicely.  If there is any "degradation", it's minimal and I can't really detect it.  The convenience is great.

I used four commercial grade 20-amp 3-way switches, binding posts from Zu Audio, and Belden 5000UP 10-awg cable (from Blue Jeans) with Panduit female spades.

I did decide to switch the negative lines as well so that this can be used with any amplifier (like Decware's where the negatives are "floating" and aren't tied to ground)

Might not be the fanciest, but it works for me!

Pic of the "guts"

But wait a tick, are those electricians tools in the back ground? No fair.

Thanks for the compliments!  I added one more mod to it for easier switching; a bar tying all the switches together.

"Throw the last switch!" ...."Yes, Master." "Give, my, creature,,, life!"

 LR,

 Man, the stuff we have seen on sites, right? Some of the products back in the 30's and 40's.... knife switches, push button switches, fuse blocks, and on it goes. All extremely heavy duty stuff. I have even incorporated some of it in the low voltage switching back in the day. Customers loved it.