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

@ debjit_g,
Absolutely agree that the listening room space and its acoustic character is vitally important and influential. I don’t want to speak for David (He’s eminently capable of doing so himself) . His listening space isn’t small and he has two far more powerful amplifiers in his home. He says without any doubt that the 3.5 watt 2A3 SET mono blocks are the best sounding match. But again, your situation may present key differences. David chime in😊.
Charles

@charles1dad yes, I had corresponded with David a while back and I vaguely remember he mentioned his room is large and open at the back (instead of front in my case). I am not sure if its still the case though. It would be interesting to get David's opinion.

I think he also mentioned that he has pulled out the speaker into the room quiet a bit. I do the same as I am accustomed to pulling out speakers way into the room with my Acoustic Zen Crescendo MkII and find the Nenuphars has the best balance. On the contrary Jon suggests 12-18" from the front wall but it just doesn’t work for me as the sound becomes way too aggressive. So horses for courses, I guess :-)

Yep, horses for courses indeed.  In the 6 Moons Nenuphar review I believe that Srajan Ebaen put the speakers further from the front wall for improved sound quality. 
Charles 

debjit_g

I have a similar room to yours but mine is 15' x 20' with an 9ft ceiling, speakers 8ft apart,  that opens to a kitchen on the left, and sit 8.5 ft from the Nenuphars.  I have the FW SIT-1 and the Ayon Audio Odin III amps.  I had better bass moving the speakers closer to the back wall with 5 degree toe-in.  I recently added the Stillpoints Aperatures to the side walls which made the greatest impact in the bass when using the FW SIT-1 (I haven't swapped in the Ayon for a while).  The lower damping factor and dual mono amps on the SIT-1 as compared to the SIT-3 might also have an impact.  

The Cube Audio speakers really intrigue me.
That said, I find it interesting that in almost every youtube video demo of the speakers,  it seems like the lowther character comes through, a sort of thinness with a peaky upper frequency highlighting vocal sibilance.