Looking for Power amplifiers with built in A/B speaker switches

Two amps!

@willywonka I'm with you on your intention to have immediate use of alternative Speakers.

I've been using a selection of Speakers for multiple years and really enjoy what certain designs for a Speaker can do for an End Sound in comparison to another. I have usually swapped out a Speaker to be used for a lengthy period to give it a chance to settle and become its most optimised for the moving parts. 

In relation to 'at ones fingertips' Speaker Switching, I never got into the idea until earlier this year, as more Power Amp's were able to be experienced in use, and the idea of getting to understand their interface with the Speakers was an attraction to be easily achieved.

The Fossi Device seems to add even more attraction. 

Any device as a intermediate control will for my usage be temporary, as when the most impressive is presenting for that moment in time, this will also become  coupled to the system in the conventional manner.

I also agree with the proposal that by not using an standalone intermediate control will be very very limiting on the options, when such a figure is attached to the Amp' purchase.

The Link shows the Neurochrome 686, which as a design holds it own extremely well when A/B against a £50K Soulution Power Amplification ( Experience had in a £200K System whilst £50K amp was included, approx' £150K system with N'chrome in use).

I'm sure in DIY Audio forum a design to incorporate a built in A/B Speaker Switch will be proposed to function as you need.

Such a route, using a build service can easily leave $10K in your coffers.  

   https://neurochrome.com/products/modulus-686 

some Preamps can select from 2 pairs of speakers: this, just serviced in March, you run your amp's main speaker wires thru it

https://www.ebay.com/itm/167985949973?mkrid=711-53200-19255-0&campid=5338381866&toolid=10001&customid=e315f656-d37b-11f0-ab27-316562663539

here's the amp from that series

https://www.ebay.com/itm/187553389748?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20231107084023%26meid%3D5960da5027b745428a765f544096b9aa%26pid%3D101875%26rk%3D3%26rkt%3D4%26sd%3D167985949973%26itm%3D187553389748%26pmt%3D1%26noa%3D0%26pg%3D2332490%26algv%3DSimVIDwebV4WithCtxRankerV1UnifiedFeatures%26brand%3DPioneer&_trksid=p2332490.c101875.m1851&itmprp=cksum%3A1875533897485960da5027b745428a765f544096b9aa%7Cenc%3AAQAKAAABELbQdNnV9E6H66rV4nIZYAZCOANuR76zl8wG%252FmKawEdd%252FZzO2T5yUdpwsFRr7Sz0JBwNXg6YDiZMumoLVy5t3Na9zGGHsGed0Y%252FW%252FkgnNIe%252BPuepM3yldAZTBJf0aLYcsbBGgUvxfpDV0JjL7bCGTZSh1dnxmky88gp3%252FoQ3725Y%252FMGtAMFlA%252B3Cb7cmpCx8ZMVAYzVgOOMKXegrQQWLEvSrnNCPyH4bsonYu0Z%252FLaU15jV2%252F7CUdR9D9rChVzhTjVGY--TrBi2%252F0aLhgriyBuD3YdWod5vnoq%252F7Eynzz2X8%252FVQzTAuAtMGr5LvZvlzgoGREj7xmuWFwwvGJcANDXzSXC0WS5BBa1yz6CXBHCmMo%7Campid%3APL_CLK%7Cclp%3A2332490&epid=110958127&itmmeta=01KBWMZW95XMW19QQ7SVRTG9T1

260 wpc into 4 ohms, run it into the preamp with speaker switching,

https://www.audiogon.com/listings/lisbgfg1-usher-audio-reference-1-5-amplifier-solid-state?refsource=hifishark

Of course, you realize, that is simply like having a Niles speaker selector box built into your preamp