That sounds nice to me. NHT (especially the older stuff) has a reputation for being full bodied and maybe a tad hot in the treble. B&K is known to be a touch warm so I bet they mate well. The 2.5 is closely related to 3.3 which is one of the best speakers I have ever heard. Can't recall ever reading anything but positive accolades for B&K in general.
How do you like it?