hmm, its a tricky one. I can see both Johns points. The room is the only thing to have changed but on the other hand, the grittiness must have existed in the old room, but that room/listening position was masking it somewhat. Since all sources are affected, logically, would there be any mileage in investing in a 518 to preprocess all sources?
My thinking is that even though cushions and curtains and canvas prints on the wall are yet to go up, and they will, I will still hear grittiness directly from the speakers. Perhaps my proximity is too close, but there isn't anything I can do about that. Would a 518 smooth out the top end a little?
Regarding speaker toe: I have them toed in currently - perhaps I should try not toeing them in? I've not experimented with angling recently.
thanks for all your responses.
Chris