Need a modern Class A monoblock, preferably half or compact chassis

h45 I like your thinking, though I am not that guy, I appreciate the effort!

rate and describe your experience

As most here know, the "synergy" of a system is important. Ok, well what does "synergy" come to, in practical, experience-able terms? That requires some "taste-testing."

The more sonic combinations I sample, the more refined my discrimination gets. Having different amps and preamps allows me to produce different combinations which sound bad or good — and which I cannot discover with only one preamp-amp-speaker pairing. Sonic description is somewhat tricky, so let me go to food.

There’s a delicious combination one finds in cobbler — buttery, sweet, crunchy. That flavor experience is unique and not something one finds in, say, creme brûlée — which is smooth, creamy, milky. Both of these also differ from, say, fruit cocktail — citric, fibrous, watery, crunchy.

The point of these food analogies is that the ingredients' "synergy" in each 'good' experience is different. Unless one tries very different synergies, one cannot know the variety of good experiences out there. Same with preamp-amp-speakers.

The other main service that multiple combinations provide is to point out the limitations of my speakers. If I am seeking a certain kind of sound and I’m not getting it with any combination, then it’s the speaker’s fault. (I’ve tried to dial in my room and subs as much as possible.)

atmasphere, name or show me a link for three to consider, I am not against the technology but so far none really seem worthy to pursue.  I did contact one mfg. recently on their brand new product... no response

@sayas If you want something that has the best of what class A has to offer I can think of three just off the top of my head

AGD

Orchard Audio

And ours (as if you didn't expect that).

GaNFETs have been around well over ten years at this point.

Finally, were I to make a change to D it would make sense to have speakers that were developed with the technology...

I run my class D amps on horn speakers made by Classic Audio Loudspeakers. They are intended for low power class A tube amps but work fine with the class Ds. I don't think you need to have a speaker as you describe; if it works with a class A amp it will work with class D too.

Well scratched the itch... XA60.8 monoblock

compared to the XA30.8 more of everything

especially finesse and dynamics

finesse with more separation of detail and hearing further into the recordings.. even poor flat recordings have more to offer which leads me to are there bad recordings or simply gear unable to dig it out.

dynamics are easily a step up from the already excellent XA30.8

IMO the XA60.8 press scattered about the internet is real.

AGD Audion monos amps have replaced my NAT 211 se2se amps which were stellar amps and resided in my system for years. My tubed preamp is a Supratek Chardonnay and I am driving Soundlabs Ultimate II  speakers which are a beast to drive. The AGD Audion amps produce little to "No Heat" which allows me to listen much longer. I worry less about tube wear and tube failures  now. I am enjoying my system with longer hours and no maintenance worries. Also they are now easily upgradeable to mkIII status being user serviceable too.  I haven't upgraded to mkIII status yet but will in the future. The AGD Audion amps are definitely "my end game" amps for now and are musically satisfying. Who ever is on the fence you owe it to yourself to seriously audition AGD products.Thanks, Alberto for such a stellar product which definitely exceeds my lofty expectations. 

Hmmm: https://10audio.com/atma-sphere_class-d/

Any idea what happened there?