I have an EX-L without Navi. What I'm experiencing is it seems the volume is going up and down and clarity going from very clear(this is when volume goes up) to muffled(this is when volume goes down). I disabled the volume compensation thinking that was the problem but it's still doing it. It's driving me crazy. It's like the head unit is adjusting the volume if it senses static on the station or something? The thing is, many times, there is no static so I can't figure out what it's doing. It doesn't seem to do it on all stations though. The station I'm trouble with the most is not local but only an hour away. I listen to it in my other cars with no problems