Why my iLuv make a loud static sound when my ipod is inserted into the dock?

Whenever my ipod is inserted into my iLuv dock it charges just fine, but if I try to turn in on and listen to music or set my alarm to wake to ipod it makes a horrible static sound. And it just continues until I turn the power off or I remove the ipod. It also happens when I insert my iphone and itouch as well. Did I get a back system or am I doing something wrong? Please help! I'm tired of waking tot he lame radio stations here.