Being your Anthem has true balanced outputs, you have nice XLRs hanging around. .
I would go for it.
Not only could you fill your awesome room with reference levels no worry. You'd finally have the piece of mind knowing you'd have to spend a whole lot more to get close to the levels of performance you've already achieved.
As to whether or not you'll really notice a difference? I think the piece of mind in just being able to crank, that beautiful AVM60 sitting on your custom rack any time or when your really focused on whatever hobby. Will work itself out over time.
Having an MRX720 my self with M80\VP160 through a ADA1250 3channel. The volumes from -40 to -10 are very miniscule to very loud suddenly. It is some what comforting to know there's head room left when it accidentally gets uber loud.
