Originally Posted by simajanpa
I too have a 05 coupe and I noticed it first time out in the car. It bugs me a little, but I got used to it, it isn't a huge change in volume.
Peace
Paul
Same here Paul. My 05 coupe adjusts up, but like you said it is very slight. Actually I find the adjust up it makes to be just right. I replaced the stock unit with a Blaupunkt receiver it does the same thing. I think it receives the signal from the speedometer.