Cube Audio Nenuphar Single Driver Speaker (10 inch) TQWT Enclosure

@rwpollock, 
That's a good observation.  Ironic in the sense that the design concept from the very beginning of the Nenuphar was to mate with low power SET amplifiers. It's been established on this thread and elsewhere that solid state amplifiers can be paired very successfully with the Nenuphars. 

I do know that David has outstanding results with his superb 2A3 SET mono blocks. I believe my Coincident Frankenstein 300b SET mono blocks would be a successful match with these speakers. 
Charles 

@stevendunn,
In a way I’m not surprised by your listening impressions using a super tweeter. I just do not believe that the Nenuphar needs this assistance in the ’vast' majority of listening situations. Cube Audio developed a remarkable wide/full range driver. Many owners find they do just fine without utilization of a subwoofer. Definitely need/preference based.
Charles

Charles  However Srajan did have a positive experience using the two Advantages Audio super tweeters with the Nenuphars: https://6moons.com/audioreview_articles/avantages2/
These are omni directional super tweeters for what that's worth.

Hi Steven , I have zero doubt that some listeners will find super tweeters and subwoofer augmentation beneficial with the Nenuphars.  I was just expressing the point that many will find them just fine "au naturel" 😊.
Charles 

I did ask Jon why he didn't use tube amps. He smiled and said he was good friends with Nelson Pass....

Jon also used Pass/FirstWatt amps and preamps back in his Lowther America days.

Robert