I agree with the above I think the 7.1 / 7.2 are both better than the 4000's. I have the bl 7.4 mounted under my bv4-50, I am very pleased with the sound and particularly the look of it, although as it is a mono speaker it is only suitable in a surround sound set up. I have added a picture, although now looking at it it seems it has been stretched in the upload somehow.
Cheers
Peter
My B&O - BS3, BV4-50, Beomedia 1, BS3200, DVD1, BL8000, BL6000, BL3, BL2, BL7.4