I recently purchased a Delphi MyFi2 and home kit for home use only. Following the instructions, I connected the unit to my Sony ES Receiver and noticed an audible humming sound. I tried different audio inputs with the same results. I have used the audio inputs of this receiver before without any problem. I also adjusted the audio level of the unit which did not help. Delphi tech support did not help either. I then disconnected the unit from the receiver and tried the FM Modulator. The humming sound disappeared. I intend to replace the RCA cable but other then that what can I do? While the FM Modulator works well and sounds fine, I feel that I should be able to hard-wire the unit to my receiver. I understand that this may be a defective unit, which I can return, but is it possible that the output of the MyFi2 is not compatible with the audio inputs of my receiver? Comments are appreciated.