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!
Hi everyone
Thanks for the follow up comments~

@tomcy6 , I know exactly what you mean and I went looking for anything simple that would explain the lack of energy in the highs (like tone controls being engaged, etc).  There was nothing seemingly out of place, and if I didn't have the Luxman to compare it with, I would likely be extremely pleased, because the low end definitely had good authority and clarity. I know I'm not describing it well, but its like the Accuphase is putting all its attention into the low and low-mid end of the spectrum, and not bringing out a ton of character/clarity in the upper ranges - there is a track we were listening to with just male vocals and a guitar: with the Luxman he's in the room with you, with the Accuphase it sounds like he's trapped in the speakers.

@petg, thanks for the recommendations (those Sony amps would be amazing to come across)

@charles1dad yeah, I just wanted to update the group because I too found it really interesting. I'm by no means a bonefied expert in any of this, but just to provide some context for the other references I've had, I've spent time with really excellent amps from Luxman and Accuphase (obviously), Hegel, Sony, Yamaha, Vincent, Technics, JP-market Denon, and a few others. The Accuphase isn't in the top 3 for me - its also possible that I had such high expectations I set myself up for some disappointment, but it is interesting that you can't tell from just the numbers how things will sound. The Luxman has stayed at the top of the list for musicality (for me). One thing I wonder if if the LX380 is sounding so good on these SS AR1s, would a higher power tube amp from Luxman also perform well? If I get a chance to find out, I'll let you know~
Pass has sounded awesome on the AR1s when I’ve heard them at shows together. Now, you can’t get the VFET amps but I’m sure X series would work well. 

I like to use the Tron soundtrack by Daft Punk at 90dbs to see how much power amps really have. Most get flattened by it. 
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!