Amplifier and Speaker A/B switcher

This is flawless

Luxman

Exactly. There are many nice integrateds that have A/B switches. I’ve always felt that’s the best way to assess speaker SQ. At least for me, my “SQ” memory is very short. The time it takes to swap cables would be too long. Assuming both sets of speakers are able to be optimized for location and position, a remote control AB switch would provide instant comparison. 

I use this.. it works for me and if I’m A/B some speakers or an amplifier it does the job. Would I leave it in line forever? Nope but I can use it to hear what I need to hear.

SOLUPEAK P3 2-Way AMP Amplifier... http://SOLUPEAK P3 2-Way AMP Amplifier... https://www.amazon.com/dp/B0BGHMGY7J?ref=ppx_pop_mob_ap_share

That one by AVA looks like the only device that will really protect your gear.  The Chinese company Douk makes exactly what you are looking for but not so sure I would trust my equipment into that thing.   

I've been using a switch made by Beresford of England. It allows me to switch between my mono block tube amps and my SS amp to the same set of speakers. Works fine and even has resistance added to protect your tube amp if left on when not switched in. I think Declare offers a similar switch.

J.Chip