I have noticed on my Eclipse brand headunit that there is considerable audible noise (hiss and buzzing) when the unit is in AUX mode and volume is almost all the way up. This does not occur in CD mode and is there in AUX mode whether the Empeg is docked or not. I suspect the AUX input signal path is not as well isolated from the digital circuitry such as the display circuitry inside the headunit as the CD signal path is. You may be experiencing a similar problem. This is reason for which I plan to use my digital outboard, which by the way just started shipping today.

Stu