I have a pair in a smaller room (10 X 11 X 8 ft) and they sound great at low volume. I do have a sub, but it is not needed with the transmission line in the Adagios.
The current amp I'm using is an Ekco integrated with KT88s, with about 25 watts in triode, and it sounds great. I talked to Robert Lee and he suggested an EL34 tube amp. I used to have a Jolida EL34 amp and it sounded good. I also used a 300B, 9WPC amp, and it sounded really good.
Personally, I like tubes better.