What kinsa EZ you got...how many bands?? b.c i know i have 2 31 band mono EQ's in my car and all u do it turn the imput and output down and it goes away...i still have a slight one but my stuff isn't fully tuned yet...if you dont have an input and output knob to adjust...try regrounding the battery my friend has a BAD whine in his and just happened to have to change out the batter and when he regrounded it it went away completely...and let me tell u it was so loud you couldn't hear people on your phone over it