Here is the scenario:

2001 Miata
Rio Mk II
Sony head unit
MTX 4244 4 ch amp
infininty components

I have the sony leading into the Rio, then into the MTX

when listening to the RIO, there is a faint whine, which get louder when i put the headlights on..and more so when i put the a/c on

when listing to the sony via the aux on the RIO, the whine is much worse, and to make it more interesting, when i adjust the outside mirrors by elecrical remote on the dash i am picking up the noise of the motor!!!

this does not happen when listening to the player (mp3s)

i have top cables in the install..even twisted cables from the Rio to the amp in the trunk

questions:

does anybody think it could be internal to the Rio tht the AUX picks up more noise than the play does?

i am using the ground that was with the stock HU (bose)

i also have a noise filter in-line from the battery to the amp

Any and all suggestions/comments would be appreciated!!

Thanks,

Ed