What is your AC line like, what power cables, ICs. isolation devices. Try some of these first and maybe speaker placement.
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I'd go with Bigkids advice first, speaker placement can change your outlook on your whole system. I know that I had mine in the same spot for about a year at one time and moved them one day just for the heck of it, It can change the sound of your system as much or more than just about anything you could buy. Can't say anything about your amp or preamp really as I have not listened to them but have always read good things about the pre.