Tube Research GT-100 and Audio Physic Virgos

I'm looking to try some tube amps with my Audio Physic Virgos. I can't seem to find any spec's on the TRL GT-100's. The AP's are a 4 ohm load. Will this be enough to drive them in a rather large room? The room is good sized and it has 20 foot ceilings.

rest of the system:
Michel Gyro deck/Brit Audio/Dynavector
Phillips modded CD/DVD
Reflection preamp
Herron Mono's
Coincident IC's and power cord
Polk Cobra