I always use Wadia with PowerMaster to bypass pre-amp. Sounds much better! I am thinking of upgrade to ovation 6.1 and need more channels (to add a center rear and 2 sub). EAD is coming out with a new PowerMaster 8000 & 9000. I am also planning to get the Sonus Faber Gravis subwoofer. What do you guys think? Should I use a tube 2 channel for music and movie? If so, which one will match well with Wadia & SF? Thanks