Amplifier and Speaker A/B switcher

I used one of those cheap switch boxes off Amazon and it worked fine.

I had a hafler xl280 and a Jolida brc 1000 tube amp hooked up to my acoustat 2+2’s.

if I was going to listen for just 20 min, I’d go sand amp, 30 or longer- tubes!

The problem is they accept very thin wire ( 16g? I don’t remember).

I had to connect thin wire to my 10g wire.

With that short a run ( few inches) and minor effect of switch, I detected no degradation in sound. I think I have a Niles unit.

I'm looking for a well made switcher that has the ability to switch between two amps (rca cables) and two speaker pairs (using banana plugs).

Check out the Niles SAS-1, it's obsoleted but can still be found regularly on eBay.

You can try Mapletree audio design, the SCC1 is what you need, I had one custom made by Al Freundorfer a few years back and it works perfectly. Welcome to Mapletree Audio Design

Of the switches mentioned, the Van Alstine is the only one supporting level matching. Without level matching there simply is no way a comparison can be valid.

As for colorations, any the switch might potentially introduce would be the same across the board, so effectively cancelled out when used for comparison purposes.

FWIW I used the Advent Speaker Comparator switch during my career, and installed the Audio Authority component switching system in the Definitive Audio showrooms in Seattle. Both of these were level matching devices, and extensie time was spent ensuring that the level match (set with pink noise and a sound level meter) was as close as possible. In both cases what was revealed was far greater than anything potentially lost, especially with speakers and speaker/amp pairing.

I'm using a very obsolete Niles CPM -31 6x6 matrix to route sources to equalizers to pre or direct to amp in... however, it's very not ss and used carefully....
Bought new; mute everything prior to switching.  Simple paranoia keeps self out of trouble...🤞 *L*

Can loop in/out a JVC JX-S777 video selector for that sort of activity, since the pre can deal with the a+v functions if the mood strikes...

Note; None of this 'switchery' is done under the influence of Anything.
A clear mind keeps the kit intact, and I use a distribution style amp that can drive 6 to 12 pairs simultaneously.....and is made to do that,  Amp swap with no fear. ;)

If I was to go at it again, with the budget to do so....?

I'd chat up Maple Tree about their SCC-1 at minimum and don't cringe at the cost.

Save that for a custom quote for the one of your dreams...

Once considered diy'ng a matrix to replace the Niles; keeping the grounds isolated as well as the signal line just during layout would make you pause.

I've looked into full digital versions, shelved until I win a Lotto...

And a large one at that...

@panzrwagn is paying attention to level matches, which would be a boon.

Sudden loud can strike unintentional fear....as will *nothing*....