We tried a pair of the MB2.5 from a distributor to see if we might want to carry the line. We did extended break-in of the speakers, since the distributor said they probably only had about 100 hours of play. So, we proceeded to put on probably another 500-600 hours of break-in. In the end, we just couldn’t get past the boomy bass. We had them in a couple of different rooms/systems where the speakers were plenty far away from room boundaries and we still were constantly dealing with boomy/bloated/undefined bass. The rest of the sound was quite decent, but really just in line with their price range. As soon as we’d go back to one of our usual speakers in these rooms, we were much happier with the sound. Needless to say, we sent the speakers back and didn’t consider the line.
My experience resonates the same as above, was not able to contain the Bass Boom and sold within 6 months of purchase, it was horrific experience, used Triangle,Harbeth speakers, never had bass boom issues with same electronics and Room.You can see my responses in scansonics speakers thread..