The B&W of that vintage are a little bright, but can be tamed with proper room treatments and speaker positioning.
My general rule of thumb is to start with the speakers at 1/3 of the way out into the room, at least 30"+ from the side walls and sitting about a 1/3 from the speakers. This is a starting point, move the speakers to fine tune from there. Eventually, you will hit a spot where the bass locks in and becomes more defined.
Also, experiment with toe in. Bright speakers work better with less or no toe in.
ozzy