iTrip w/ dock connector giving constant background hiss/static

i know there really isn't a forum for 3rd party gear but i thought some of you may able to help me out.
i am using a 5th gen ipod. for car audio solutions: i started with the griffin roadtrip apparatus.. it was clunky and the sheer weight of the ipod caused a real finicky electrical connection resulting in the thing cutting out every time i hit a bump. so anyway i returned it and got a griffin itrip (with dock connector) and a powerjolt cigarette lighter adapter. the form factor is way better than the roadtrip but the thing has a constant background hiss... is this normal of these?? i mean it is subtle but it definitely doesn't give crystal clear sound... the roadtrip on the other hand did give a much cleaner signal. anyway now i am thinking of returning these two items (the power adapter and the itrip) and getting the new "itrip auto". but before i do this, does anyone know if it broadcasts as clean as the roadtrip or better yet does anyone have a work around for the static problem of my current setup? ideally i want the form factor of the itrip and the cleanliness of the roadtrip's signal.
this is such a pain!