Speakers for First Watt SIT-1 amp

Hello ggking,
You have created a very interesting thread and I will add that you have what is considered a unique and well regarded amplifier. You have received some very thoughtful posts from Audiogon members who are quite respected on this forum.

For all the positive attributes of a single driver speaker they have a few acknowledged shortcomings (as do any speaker niche). Playing complex or "busy" music and particularly at higher volumes is one of them. David_ten mentioned the Cube Nenuphar a new speaker from Poland. It was given a stellar review by Srajan Ebaen of 6 Moons. com. I find this very relevant given his extensive experience with single driver speakers (including the expensive Voxativ from Germany).The Nenuphar seems to have reached a new level of performance in this genre.

Another option is the Coherent Audio speaker (Toronto Canada). This is a 2 way design with a very simple crossover, 95db with an 8 ohm impedance load that is reportedly very flat. Based on owner word of mouth and professional reviewer show reports it sounds fabulous driven with low power amplifiers. I suspect it could be terrific with your S.I.T.-1 mono blocks.

BTW in the 6 Moons review Ebaen found the Cube Nenuphar to sound superb paired with the S.I,T.-1 and S.I,T.-3 amplifiers. He gave a slight preference to the S.I.T.-1.
Good luck ,
Charles

Id vote for a Voxativ ...perhaps supplemented with  a REL sub.  They have a FIT model now with a 5" driver ... perfect for mid size rooms.  $5700 with the AF2.6 driver. 
FYI, I owned a FirstWatt F7 and my Voxativ sounded lifeless with it.  I almost opted to try the SIT3 but the reviews were meh.

ggking7, I can comment on my own experience with single driver speakers vs multiple. I listened to Lowther in fideleo cabinets for about 17 years exclusively. They are wonderful speakers. Great imaging, very dynamic etc. I have to tell you I don't miss them after trying the Tekton open baffle speakers. Again, it's not that the Lowther's were by any means bad, but the Tekton's took the system up a couple notches in regard to just about everything. The place the Lowthers better them by a small margin, is width of the sound stage. The Tekton however give me more detail (without anything close to analytical), speed, stage depth, & instrument presence.      

charles1dad, thank you for the recap. I had missed that Cube Audio does single-driver speakers. Wow the 6moons review of the Nenuphar is exciting, especially since I already have the SIT-1. It looks like the Magus and Bliss C each go for around half of the Nenuphar’s price. I think I’m between Cube and Voxativ at this point. My impression is that Cube is a better value. Does anyone have a handle on how the speakers from these outfits differ as far as performance?

I should also mention that I'm using a Rythmik sub but it sounds like it wouldn't be needed with the Nenuphar.

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