My owners manual doesn't mention anything about the Harmon Kardon audio system. I have the regular owners manual and the Business CD Manual. There is also no mention about the vehicle speed sensitive equalization. I find that strange. Are all the 2001 owners manuals like that, or did I get an old one with my new 330cic? According to the 2001 3 Series Convertible brochure, it is a standard feature. Strange how there are no instructions or mention of it in the manual. From what I learned on the forum, I have adjusted the speed sensitive equalization on my car. Thanks to all of you for your informative posts. Rich