on this adress (http://www.bose.it/), you'll find a full description + pics of the BOSE system in the 147.
You can see, for example, that the speakers are coaxial ones, so, the tweeter places in the doors are EMPTY with bose system (tweeter are well there with the classical system) !
So, obviously, the alfa 147 Bose System is a basic Bose system, not a high tech one.
But for the price, the Bose is great (for an original fitted system)and is of course better than the classical system.
Those who think that bass are too low are people who are looking after what I call "BOUM-BOUM Music", or, if you prefer, high bass for the pedestrian ! If you want this, the only solution is two 38cm Focal bass speaker and a 1000 W class A amplifier......not the same budget if you see what I mean.