@russ69 +1
OP I hate to burst your bubble (again), but...I've owned them. Brand new back in the early 80's around the time Hitachi launched one of the first CD players and Dire Straights released one of the first DDD CDs, Brothers in Arms. They were really expensive.
901s are designed to work with the EQ period. But it's weak "science". The bass is "fake" for lack of a better term.
BOSE is a very good marketing company.