Originally Posted by ntguru

wcmack,

There appears to be a general issue with some sort of ground loop. My Pioneer Xm2Go receiver causes a terrible hum when piped in through the aux jack and with the power transformer plugged into either lighter socker. For my Ipod I have a Belkin ipod adapter which appears to have a small transformer (isolation?) and amp in it and that eliminates the hum issue with the ipod. It's also very nice because it allows me to match the ipod volume level to the radio/CD.