Atmasphere,
Rebbi's room is about 11x12, my office system, 14x16. Believe me, even true 92db, 8ohm, no problem. My 8 watt Coincident Dynamo is sublime with my 95db or 98db Lores depending on model. How loud do you listen? I generally like about 80db, sometime louder, never a problem. I could't listen much louder in a sustained way without ruining my ears. I really loved the Gizmo and OTL, but even he eventually went The Big Tannoy with 300B. Best Rob
The big Tannoys seem a better match for SETs. They also work well with our amps. FWIW, Harvey tampered with our amps when he had them at his place, and not in a good way.
Just so you know, SET listeners tend to play at lower levels due to the distortion aspects of the amp. Once you get over about 25% of the output power, the higher ordered harmonics come into play. The ear uses these as loudness cues, which is to say that when these distortions show up, the amp sounds like it is playing louder than it really is. So you tend to say "that's loud enough!".
I like to play the system at louder levels, but the amps that I use don't make the higher ordered harmonics until very near full power, so the system is absent of artificial loudness cues. IOW, at 95 db it does not sound loud at all.
My speakers are 98 db, my room is 17' x 22' and fairly well damped.
Audiokinesis makes speakers that are more efficient than the Coincidents, and often they are 16 ohms. If I am not mistaken they are less expensive as well. So they might be good to have on the radar as well.