While I generally agree with this, sometimes a certain speaker and amp combination just do not have synergy. In my particular system, there is no room correction or even pre amp, it's just an Oppo 95 and a Parasound A21 running Paradigm Sig 6's in a stereo set up. The room is large with 9 foot ceilings and carpeted with nothing between the speakers and the listening chair(like a coffee table) and I was getting sibilance with volume peaking at 82db or above which is maybe one watt per channel with the Emotiva amp. Mind you that was only with some recordings, not all.
Perhaps with some pre amps it would not be an issue, but I would be cautious in getting an Emotiva XPA amp if you have speakers known to have a brighter top end.