SET 45 Amp Driving Dynamic Speakers

I am using a Yamamoto A08S SET 45 with EML mesh tubes, driving a pair of Zu Audio Druids in a dedicated listening room about 15'x18' and the result is just stunning.
The transparency, detail, tempo, balance and realism is far beyond anything I've ever owned before, or even heard with other people's systems, some costing 10x and more. The cost of my amp + speakers (new) is less than $9K. I couldn't be happier with this setup.
True, it doesn't play nearly as loud as my living room 60lbs, 700 Watt Classe SS amplifier, and I don't expect it to.
When I want to turn the volume up and listen to hard rock, metal or electronic music at live concert levels, I do it in my living room with a system that excels at that :-)
Maybe one can have both worlds. I haven't found that setup yet, but I can only guess is that if it does exist, it will probably cost 20x more than both my systems together.

Ami, that's one of the things that I said - two very different systems.
Charles, of course I like what you do as well. But that's not all. Even flamenco music requires speed an drive let alone Mahavishnu Orchestra's jazz fusion. Bass is important too. Not exaggerated, but just as it was recorded.
It does appear that I strongly gravitate to Lamm/Atma-Sphere camp. Never heard VAC or Allnic let alone Ypsilon and Absolare.

I'd read a lot about 45-based amps requiring very efficient speakers (over 100dB), but I've run 45 amps by Korneff, Burgess and Yamamoto with Vaughn Triode speakers (97dB) with great success. 

My room is 21'x19', I generally don't listen to very loud music (in the mid-70dB range) , but the system was capable of much more and with a wide variety of music. 

Ultimately, I went back to Harbeth with a high-powered SS amp, but I do miss the lushness and intimacy of the 45. 

Hello Ralph (Atmasphere).

I've seen your comments before and I am keeping them in mind as I design/assemble my new system, a 4-way active. If using a 45 amp to only reproduce 350 to 2000Hz on a 100 dB/W driver in a 25m2 room and if average listening level is 85-90 dB SPL, would a 45 suffice or be driven to the point where 5th order harmonics become an issue?

Thank you!

Inna,
I will tell you that timing, musical pace,flow and drive are strengths of my SETamplifier be it small bands or larger combos. But again I don’t know what SET amplifiers you’ve used or are familiar with. As with any other genre of components there’s a hierarchy and broad spectrum of performance.

If you look at my system page you’ll see a picture of 3 sets of mono block amplifiers, my SET,my 100 watt push pull and a borrowed Lamm push-pull 90 watt amp. Of these three choices the SET mono blocks were the best sounding driving the same speakers in my room. I appreciated the generous loan of the Lamm from a friend. It’s the most expensive of the three amplifiers but wasn’t the best sounding.

Now again that is only my assessment based on my taste and my system. You or someone else could rank them differently and that is easily understood. What moves me may not move another listener, no arguement on that point. It simply depends on what you want. We listen,compare and ultimately decide. If ever an undertaking was subjective, it is definitely High End audio and listening to music. The SET elicited the most emotion and musical communication/involvement.
Charles,