You may want to have your EE friend check his facts!
Originally Posted by TGray5
I just talked with a friend who is an electrical engineer about this subject and he said that BT definitely has reduced sound quality compared with direct USB...so I think I'm going to load music onto the HD and when I want to pay from the iPhone I'll plug in. I did spend the money for premium audio, so no sense in feeding it low resolution data.
Gone but not forgotten: '99 328, '00 328, '02 M3, '05 X5, '06 330, '07 X5, '08 Z4mc