In the website it mentioned for F30 the audio system is having 16 Harmon Kardon speakers ... am guessing this for the 335 ...But in the brochure for 328i ... it mentioned 9 speakers ... no mentioned of brand ... Anybody know what is the speaker brand in 328i ? As for a RM290k the audio have no match against the cheaper basic audio in the A4 ...Any idea how to improve the sound quality ?