SET 45 Amp Driving Dynamic Speakers

I have not heard the Nenuphar.  I am certainly interested in that speaker because it has gotten some favorable comments.  My understanding is that it employs transmission line loading which means it will not be as efficient as the Charney speakers.  But, if it offers good sound, I am certainly interested.  I should have also mention that I have heard, and liked both Voxativ full-range systems and a few other full-range systems employing Voxativ drivers.

I am surprised how much improvement full-range systems have undergone in recent years.  I the past, I've generally liked systems employing "full range" drivers as wide-range drivers in multi-way systems, but, I did like pure one-driver only full-range systems.  The Voxativ system I heard changed my mind to some extent, and the Charney, even more so, has altered my view.  Now, I need to hear the Nenuphar.

Yes, it certainly isn't as efficient as the Charney or the AN-Es.  My 45 amp wasn't able to drive the Nenuphars.  I ended up using a 32 watt PSET.
Cost and room-size are limitations for me with regards to large horn systems.  I have, however, heard a few of these over the years and it was the sound, not the cost or size, that was the real deterrent.  The only horn that I've heard that I could happily live with is the Odeon 28/3 (and, I assume, their higher models).  Unfortunately, they are no more efficient than my AN-Es.  In fact, less so.  

The vast majority of horn-based systems, particularly modern systems, are not my personal ideal.  Many are excessively colored (nasal or shrill or ragged sounding) for my taste.  Among those that I like, would be the Avantguarde systems and Edgarhorn systems.  It has been a while since I heard and Odeon, and I thought it was okay back then.

But, certain older systems and new systems with certain vintage drivers sound very good to me.  I like old Western Electric compression midrange drivers and the various Japanese clones of these drivers.  These systems cannot be mass produced, so they really don't represent commercial alternatives to speakers like the AN-E.  

Yes, those vintage drivers and their Japanese clones are pricey. I haven't had the pleasure of hearing either.
I heard the Odeon in the same system as the Nenuphar. Neither was drivable by my 45.  When driven by a more powerful amp, I preferred the Odeon.  It sounded closer to my AN-Es but with more grunt, shove, and dynamics.  The Nenuphar presents a light, quick, and airy sound in comparison.  

I'm reading this, almost midnight west coast time, doing all kinds of experimenting with my amps and speakers and iPhone spl meter.  I have  new Thomas Mayer 45/2a3 and a Slagle passive pre. I don't listen loud average 75-80.  My speakers are in the 99 db sensitive range. Like other I'm happy with my 45 tube and what it does for me, I think.  I've listen to a few rock and roll songs over and over. The 45 and peaked out at 87. it was more that I was comfortable with... and according to @atmasphere  its because of distortion and not because its too loud? neither the passive pre dial or my  digital volume on Roon was to the max. I then put the 2a3 in to see if the sound was more dynamic because i was not clipping or now there is less distortion? Listened to the same song. Probably annoying the neighbors now.... and i peaked out at 89.5. it felt louder but i surely it can't be getting distortion, I'm just having a hard time understanding.  Its just math right? watts, listening level, dynamic range.