Hey, I have a F90BT with my iPod hooked upto it.
It seems like my DVD audio is quite a bit lower then my iPod/FM stereo audio. It's not a huge deal because I can turn it up and make it easily heard but when I turn it up I start to hear background noise/hissing and it irritates the crap out of me. iPod/FM i keep the volume to about 20/25 and it sounds fine, but for DVD I need to double it (40/45) to make it match the same output of my iPod/FM.
Any idea what causes this and/or know a fix?