Amplifier and Speaker A/B switcher

"swapping the speaker cables by hand" That's the way most of us do it.

What about turning the amps around so the speaker connection are facing outward?

How often do will you be doing this?

If I had to do it again, I.would still go with a box, a bunch of dual banana jacks and a pair of dual banana jumper cables.  I don't think there is a switch that is as neutral transparent as a banana plug or screw down connection.  High current solid state switch?  Works for line level switching.  I'll throw this one at McGowen.

Depending on the concerning ear, everything you put into the signal path will degrade the sound.

Years ago, I needed to do what you want.   But I needed to be able to switch 4 turntables, 6 amps/receivers, 2 aux and 12 pairs of speakers. Plus, spares of each.  I had a hard time finding the switches i needed.   And wiring them together would be a rats nest pain.  That's why you pay the big bucks. 

So, I made a Patch Board.  Pamona banana jacks for power outs and speakers.  RCAs for turntable, aux, pre out and amp in.  Using patch cords I could switch. ab, mix every which way.  Was not a quick turn or push of a switch but did the job.  And all the connections were right in front of me.

Follow up.  Paul McGowen does not know of a solid state speaker selector switching module.

I looked into them on ebay.  Including the TC-7220 2-Way Amp Amplifier  Speaker Selector Switch Switcher Splitter Combiner.

Several things bothered me, 

-Their Switches.  If there is going to be sound degrading it would be right there. Even on a 15amp toggle the contact surfaces are like millimeter.

-They tie the black negative leads together!  Switch the red positives.  Some solid state amplifiers use differential output drivers.  Their black negatives are NOT common or ground to anything but their red +.  They only like their + side.

-Internal wiring. Far from "audiophile".  Another choke on quality.  But an easy mod.

I could not see inside the TC-7220 to see if they keep the negative leads separate.  I also suspect their switch too.  Probably will work with the tube amp.  I don't know about the Schiit.

What to do?  Spend the bucks.  Buy what has mostly you need and modify.  Or build thy own from scratch.