Tubed Monos for Focal Aria 948s

Congratulations on the Sopras. They are beautiful speakers. I've been playing around with placement of the 948s. I positioned them a third of the way into the room and set them 3.5 feet off the side walls without toe-in. The soundstage really developed nicely after that. I've been using Tool's Fear Inoculum to test it. Could always hear the guitar and bass directly from the left and right speakers respectively before but since spreading them further apart, the band is all in the center now. I raised the front of the speakers about 5mm to raise the soundstage a bit and the bass really came to life. On cello soloist music it's like I can feel the vibration of the wood body now. I don't think I will mess with the amps now. I'm going to enjoy this for a bit.
Glad to hear you're enjoying the Sopras

Micromega M150 would be a great match for Sopra N3, I have M100 and looking into Sopra N1. or N2. However, beware of Micromega, LAN on my M100 stopped working, and I've tried to contact Micromega every way I can, they do not respond..........

Speakers are efficient yes, 
dontmshort change yourself on a low,powered amp.
get something with power.
your ears will thank you.

My past experience with Focals is that they can develop a distinct L, C and R image, but without the ability to fill in between.  I was able to fix this with just a little toe in. 

@arctikdeth I'm running a pair of 180w mono blocks into them now. I would like to keep the wattage up there if possible.

@erik_squires That's exactly what I noticed too. I spread the speakers further apart and removed the toe-in which seems to have worked in my room.