I have a FG xr6 turbo ute, have had my whole sound system overhauled by GL PRO SOUND in melbourne. I have gone very quality gear such as Rockwood Fosgate P2 sub, 360.1 sound processor, T6004 4 channel amp, 6.5inch MBquart Reference splits in doors, quality wiring.... and still have that sh*tty hissing noise when music is turned down, even when I put a cd in I can hear it reading the tracks if that makes sence. They said to me they have tried everything, and have contacted Rockwood Fosgate who supplied the 360.1 digital proccesor and they just said that the Factory ICC must be starving and is no good. If anybody or any car audio workshop has a fix please let me know how to fix or ill pay you to fix it!! Its annoying because you pay top dollar to kick ass gear, to get this mothy sh*t hissing noise! that's my rant... cheers guys