Avantagrde UNO w/ CJ Premier 8

Power is not an issue at all, however your gain could be very high with the preamp, and in turn with noisey tubes will show you this, you might not get to high on the dial either, I heard the Duo's put with a 40 watt intergrated solid state and it was excellent, however you could not turn up much past 1/4 knob.

Oh yeah the Thor amps are sweet definatley, I have heard them on Coincidence another hi efficiency around 10,000 speaker, but they are not nearly as efficient as the Avantgardes, I think they are around 97 db but very nice with Thor, I really like the hockey puck design too, most people dont'. Truth is that yeah I can see where your issue is, mainly its not cause of the efficiency not using that power but because the Uno is Bass powered right? I forget but I know the duo's are, and if you are then doing nothing but running the mid horn and tweet horn then no bass is even being driven to soak up some of the balls of those tubes and your "tone:" might end up better with smaller sweeter amps no doubt.