what kind of AM reception should I expect from a '99 A6 Concert system? In my truck AM for the most part is just fine, but in the A6 it's nearly non-existant. Just wondering what the norm is.

And the drivers front midrange seems to have a rattle at low volume. What's the typical failure mode? Loose speaker/grill/bad speaker? If it's a speaker, can they be had from somewhere else besides the dealer. I don't want to think what they would charge.