I had the pro hu and the std speaker system with my E87 which I soon upgraded via the Alpine route... I always assumed that the BMW Business speaker system was on par with the Alpine, ie tweeters in the mirror housings in the front doors... However, after checking in the options spec list,
http://www.bimmerpost.com/goodiesfor...lequipment.pdf, it would appear that tweeters are not included in business pack for the F20 just mid-range speakers front/aft/dash with two woofers... You have to specify the HK system to get any real, "HiFi" potential, which is what I spec'd for my new F20 expected in March...