MC Mondeo Buzzing Speakers

[Ros5co]

Have had my vehicle for about ten months now & noticed a few months back that the tweeters tended to buzz occasionally. Oddly mainly when listing to AM radio or having a conversation with "Bitchin Betty" about which "device" I want acted on.
With USB music or FM Radio they seem fine.

Anyway I mentioned this to my Ford Dealer at the last service & of course they were unable to get it to show up while they had it. At the time it was quite intermittent along with the occassional dropping of the right hand speaker when first turned on. This rectifies itself when I adjust the volume usually but again is vary intermittent. Dealer checked leads & all contacts were good.

I did check the forums on the UK Ford site & did find some discussion which indicated that the anchor points for the speakers cause warping of the chasis which in turn causes the buzz. This doesn't really explain why it doesn't seem to be a problem playing music or listening to FM radio though.

The buzzing is far more frequent now so I'm waiting for an opportunity to get it back to the dealer, although I'm not hopefull of a successful outcome.

Thought I'd post this here in case anybody else has experienced this although I havn't seen anything mentioned.

BTW has anybody been able to turn the system all the way up & still stay in the car? I stopped around level 20 I think so I still don't know what flat out goes to! It sure can crank when you want it to.

Cheers