the 'premium' jbl system is really bugging me sound-wise. In the driver's seat, my right ear gets funky - like stuffy, or like my ear has to pop (only it doesn't) - my girlfriend has the same experience. I am beginning to suspect some very high frequency noise? - maybe from the tweeters? Is anyone else experiencing this? Do any of you have any ideas about what this might be? Something wrong in the crossover with the amp or the head unit? wiring? I'm not very tech orieented, so not sure what to think. I've called and talked to the service dept where I purchased my Prius and the guy clearly thought I was nuts (doesn't bode well for taking it in for a check - Dublin Toyota). I notice that if I activate ACC (press 'Power' twice, engine off) that there is speaker noise from the tweeters, with stereo system off; I wonder if this is part of it - though my ear experience happens when the stereo's on. I'm concerned for negative impact on hearing over time. I've been beginning to look into replacing the stereo, but the techs at Toyota service say this can't or shouldn't be done (they say nay to even replacing the underseat amp). Any knowledge or feedback would be awesome. Thank you one and all. I really love great music in my car. Good music - don't leave home without it. Help!