Q: When I play my iPod the sound is terrible. Vibration etc. on 2007 BMW 335xi

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The radio and cd's sound fine. Dealer blamed the cable connecter but upon swapping with a friend it made no difference. iTunes or downloaded cd's are all that's on the iPod so good sources. Help!
(1) Answer
(2) Comments
Yes it's a factory connection, and the iPod is new- 6 months. But no, I have not tried a different one.
I'd try a friend's just to rule out the connector on the bottom of your ipod before chasing other potential causes.