Thoughts on Tube vs SS amplification for Sony SS AR1s

Hi all~
Was hoping someone with more knowledge than me may be able to help clear up some confusion I’ve been having.
I recently was able to acquire my ‘unicorn’ speakers, the SS AR1s.  4 ohms, 88 dB, 28hz-60khz.
i have an integrated tube amp, the  Luxman LX-380, which on paper doesnt seem to deliver a lot of power for these speakers (14 w into 4 ohms), but i have been really surprised by how full/robust everything sounds with the Luxman in place. I had been advised that a more powerful SS amp (‘at least 200 w per channel!’)  would be needed to get the most out of the SS AR1s (and i have had a lot of SS amps in the past), but To be honest I’m pretty impressed with how it sounds already - So,  i was just hoping someone with more experience here could weigh in? Is it necessarily true that tubes just aren’t a good match for a speaker of this sensitivity? Would a more powerful amp like the luxman mQ-88uc (25 w into 4 ohms) be worth looking into? Would a powerful SS amp really make these speaker sing (and i just dont know what I’m missing)? I want to take advantage of the low-end of these new speakers (which is the main difference from my previous pair), so looking for some guidance re tube amps and exerting control over speakers like these.

thanks much!
One has to ponder that there are things listeners can clearly hear that (At least for now) aren’t being measured or maybe can’t be measured.
In this case I don't think so.  The Luxman is able to behave as a proper voltage source within certain limits, and the 8 ohm power they are getting out of it suggests that it might be set up so that it can put out a bit more power into lower impedances. This is done by simply 'light loading' the tubes in the output section by setting the primary winding of the output transformer to a bit higher impedance. On top of that I'm pretty sure that Luxman did their homework on the output transformer and has something that is spec'ed decently in there. This all does not seem that mysterious to me- I've seen it before.
I understand your point and the significant importance of the output transformer. In threads discussing tube amplifiers I consistently advocate the undeniable need for high quality transformers if one is seeking excellent sound quality from tube powered amplifiers. 

My point is if you look at the Sony SS AR1 speaker measurements they are as George and others have rightly noted, a ’challenging ’ speaker load given its impedance curve and phase angle characteristics. Armed with this knowledge the last thing you’d recommend is a 14 watt tube amplifier.

The low watt tube Luxman is doing something obviously good that can’t be surmised from assessing its measurements or those of the Sony. So again, how is this gross mismatch (Via documented measurements for both products) able to produce such high quality sound? Something is occurring that isn’t accounted for with supporting test bench numbers.
If we weren’t in the middle of a pandemic and people lived nearby, I’d invite you all over for a listen!
I have seen this same phenomena play out with electrostats... Where most Solid State amps that double down/up on watts vs ohms just don’t sound very good while reasonably decent tubed amps, with much lower watts, sound wonderful... Excellent Transformers seem pretty rare in modern SS amps... I suspect there is a correlation between transistors and transformers and speaker impedance most SS amps just don’t play well with... Makes me wonder how bad a Class D amp would sound with these speakers...


Amplifiers that can double (or nearly double) their power as speaker  impedance is cut in half are touted as mandatory for difficult speaker loads such as this Sony. Although logical to the core, sonic results can be surprisingly poor sounding.. It is  just intriguing that there is no solid  explanation  for a good result such as the Sony speaker/Luxman amplifier or similar such  scenarios.