I am installing a new Rio Car/ Empeg in my Porsche Boxster. I hear a lot more audible noise than I think that I should be hearing.

I am running the Empeg front audio outputs into the factory Becker CDR-220 head unit aux inputs. Ground is to the Becker harness ground wire, very close to the head unit end. +12 vdc comes from the console harness.

I am hearing alternator whine as well as a lot of noise from the Empeg internals, both with and without the disk spinning.

Adding a ground loop isolator to the audio lines eliminates the Empeg noise but not hte alternator whine. At the same time the low frequency response is somewhat degraded so I would prefer to avoid the isolator if possible.

I would sure appreciate any advice any of you might offer. I see little reference to this type of problem on the install notes part of the board.

Lynn