Speakers for First Watt SIT-1 amp

Hello ggking7,
If you really decipher Srajan's glowing praise it would suggest that he's quite possibly more unimpressed by the Nenuphar than the voxativ models he is very familiar with. Send him an email for his thoughts  on this. He's actually pretty responsive to inquiries from readers of his site. .  In your case  particularly as he owns your amplifier (for several years) and holds it in the highest regard. He seems genuinely moved by the sound quality of the Cube Nenuphar and this would explain the very rare award he bestowed on it. 
Charles 

Ggking7, 
You mentioned the Cube Magus (8 inch driver) this speaker received the coveted Blue Moon award last year. So you know how impressed he was with its performance. It appears that the Nenuphar with the newly developed 10 inch driver and very powerful motor/magnet unit (and special cabinet) is clearly superior (to his ears) and explains the justifiably higher cost. This seems to be a very  upper echelon speaker.
Charles 

Has anyone heard single-driver speakers that don't sound congested with busy music?

ggking7, If you get the chance please check out Charney Audio. Charney builds full range single driver horns based on the tractrix theory. I have a pair of the Maestro with Omega RS7 drivers that sound great with SS and tube. Uncongested engaging sound with whatever you throw at them with no need for a sub! Performers are in the room with exceptional imaging, sound stage, and 3D presence. From soft passages to highly dynamic music are presented in clean clear emotionally engaging  sound.
 
Charney builds 4 models with your choice of drivers from Omega, Lowther, Voxativ and AER.  The Moderno, Maestro, and Excaliber are the same horn but with a different cosmetic look depending on your decor. The Concerto is a largest of the group.

Charney is located in Somerset NJ and will be at Capital Audio Fest in November. Make an appointment, bring your S.I.T. 1, or stop by the room if your at the show.

http://charneyaudio.com/

Voxativ and Charney (with Voxativ driver) are among the better full range systems I've heard.  The best full range driver I've heard is probably the old Jensen/ERPI M-10 field coil driver.  But, even with this driver, I prefer the sound with a tweeter on top (the M-10 run full range with a simple 6 db/octave high pass to a tweeter, preferably a 597 field coil tweeter).

I heard a friend's home made SIT amp that utilized the First Watt schematic.  I really like that amp.  I heard it on a custom-built horn system, so I don't know how it sounds in a system that is harder to drive.  I would wager that it would work well with Audio Note speakers which are somewhat efficient and are easy to drive.  

A couple of clarifications for those following the thread and the Cube Audio posts, specifically.

The Cube Audio Bliss C was awarded a Blue Moon Award by 6Moons in Oct/2017.

The Cube Audio Magus was released after the Bliss C and was not reviewed by 6Moons. There is an excellent review of the Magus by HiFi Knights here:

http://hifiknights.com/reviews/speakers/cube-audio-magus/

The Cube Audio Nenuphar was awarded a Lunar Eclipse Award by 6Moons in 8/2018. It is Cube Audio’s latest driver / speaker.

The drivers in each speaker are as follows:

Bliss C > Fc8

Magus > F8

Nenuphar > F10

The Nenuphar is best suited for large rooms, the Magus for moderate sized rooms (per the Cube designer).