I bought some Ferrite clamps at Radio Shack and they worked great. I put one on the Amp power cord, one on the CD, and one on each speaker cable. The sound did get cleaner, though I am not sure where it helped the best. Another Tweak I used is to put some Dynamat pads (buy em at Crutchfield) on the inside of my CD player, which dampened a lot of resonance and gave me some deeper bass. I also cut some pads and put them on the back of my B&W DM603 S2 speakers, and WOW!!! Resonance was deeply cut, mid-range came soaring out, and bass extension went way down. The cabinet resonance was cut in half, and I'm now thinking about investing in some of those sorbothane sheets instead of the Dynapads. But if you have big floorstanders with MDF cabinets, try the Dynamat pads.