I currently have a very satisfactory in car installation with a Parrot CK3000 EVO bluetooth handsfree for my phone calls and a USASpec adapter hooked up to the dock connector of my iPhone to provide audio (including navigation instructions from Navigon) through my car audio system as well as charging my phone. My question is, if I switched to an A2DP handsfree would I still have my audio coming through the dock connector and USASpec adapter or would it be routed via the bluetooth connection? I've read that once connected to an A2DP device all audio goes via bluetooth although it would seem that some apps (including the iPod on the iPhone) have an option to disable the bluetooth connection. But I don't know what would happen to the navigation instructions although that's not a major issue. But not having access to an A2DP device I have no way of checking this out so would appreciate any info anyone can give me.