Just got a amp installed with a set of splits and 6" speakers...sounds ok, bit too much treble so im getting a sub installed. One problem...I hear this constant "XXXXXXXXXXXX" noise when the volume is low, its even their when I turn the volume to zero...its not rediculously loud but its noticeable and it definately wasnt their with the factory stereo...any ideas what it could be??? ps sorry for the noise description, its the only way I could write it haha