Barilkobart,
Good Heavens! Your room is huge! (almost four times the volume of a standard room.) You were driving the Pioneer into clipping and shutdown trying for loud sound in a huge room where you should be using a separate power amplifier like the Bryston, and a larger one since you drove the 3B into clipping. Colleagues of mine at Axiom with a taste for high playback levels who have large rooms use power amplifiers rated at 200 to 350 watts per channel with Axiom M80s in the main channels.
From what you indicate, Ithe Denon AV receivers would not be adequate for rooms of that size and the sort of levels you are seeking. Most AV receivers do not produce nearly the output claimed when more than one or two channels are driven. (H/K is one of the few that do.)
By the way, the Brystons are excellent power amplifiers, built in a town (Peterborough, Ontario) not that far from where Axiom is located (Dwight, Ont.). We have Brystons at the Axiom plant and at the National Research Council in Ottawa.
Regards,
