I am in full agreement that looking at HE Speaker designs will vastly increase the options available for power amp selection. I introduced HE Speakers to my system more than one year ago, and it was this experience, combined with other experiences over the previous few years, that led to my profound change of mind towards long-term used ESL Speakers. ESL speakers have been used in the home system since the 90's, and during the Christmas Holiday of 2025/26 were dethroned and put into storage.
I now have two cabinet speaker designs that are selected for regular usage. One is a HE design, which is not overly complicated as a design, and another is much more complex as a design model.
The low-watt 300B works wonders with the HE Speakers, as do the 845's.
The 845s create jaw-dropping end sound with the more complex speaker design, and the 300B is under interrogation over the past few days to learn whether there is a reason to use these with the complex speaker design?
HE Speakers are built with a design that does not suit all who are intending on using a cabinet speaker, or even deciding on an OB design. HE models with attractive High Efficiency for a Cabinet or OB design are typically large in their dimensions. I'm not suggesting unattractive, but noticeable for their presence in a space.
As for myself, I have two Speakers competing for the prime real estate in the main listening room, which involves Speaker Logistics and resetting up the Speakers to ensure the alignments are accurate. My solution now is to run two systems, one for my Wife in a place she frequents using the HE Speaker and keeping the other speakers permanently set up.
The conundrum remains of how to keep a selection of Power Amp's - Powered On. My solution is to be satellite speakers to create the load. these can easily be masked from view and easily managed when swapping out Amp's to be connected to the main speakers.
The use of satellite speakers will reduce the Amp swaps to minutes as an interval between them. The swapping HE speaker and other design was easily a 30 minure exercise and precarious as a task. Two being involved was the most sensible method for handling the exchanges.
Just Saying - Good Experiences can have their idiosyncrasies blatantly exposed, until improved options become discovered? Improved options for one are for another their worst nightmare.