I have revisited the B&W 683 FS being driven by a Rotel RB1582 Power and Rotel RC1550 Pre and source was an Onkyo CS-5VL CD/SACD player
In one word - Luscious bass and treble!
My only gripe is the midrange is too open and heightened for my taste.
Yeah Ivan is right, amp pairing is key for the 683 if you want for its sound to bloom properly.