You may be fine with the old Bryston, I don't remember my DQ-10's as ever being a bright sounding speaker. It's been a lot of years..don't the DQ-10's have Mid/Treb. controls on them that allow some adjustment? I may be thinking of another pair of speakers I used to own. Anyway, let us know when you get the Bryston hooked-up. The speakers may need some break-in if they have not been in use for a long time also.
Dave