Yes, give them time. If B&W is still using Kevlar drivers, it is pretty stiff out of the box. They also use a rubber material for the surrounds instead of foam, which needs to loosen up.
I own 5 pairs of B&W speakers (out of many more pairs). None of them sound bright and harsh...
B&W speakers also tend to be pretty neutral. So while some say change the speakers again and don't mess with the system (maybe); you could be spending the rest of your life looking for the right speakers to fit what may be a harsh sounding system to start with. What prompted the change in the first place?
It could even be many things in combination, including the sources, cables, even crappy electric power. Your favorite CD for demos may even be poorly recorded, and the old speakers masked it.
I own 5 pairs of B&W speakers (out of many more pairs). None of them sound bright and harsh...
B&W speakers also tend to be pretty neutral. So while some say change the speakers again and don't mess with the system (maybe); you could be spending the rest of your life looking for the right speakers to fit what may be a harsh sounding system to start with. What prompted the change in the first place?
It could even be many things in combination, including the sources, cables, even crappy electric power. Your favorite CD for demos may even be poorly recorded, and the old speakers masked it.