I'm getting a little bit of hum from my main speakers. I'd like to get rid of it. Right now I am using the fairly good cables that came with my Sherwood Newcastle AVM9080 amplifier (preamp is the matching AVP9080). I was thinking of trying some BetterCables, I think the problem may be that my cables aren't shielded well enough. Am I on the right track? I get silence when I turn my preamp off and leave the amp on and I get hum with the pre on (on digital PCM sound with nothing playing - so the source is within the preamp). EDIT - that was incorrect - I got hum even with the pre off. Since I'm a vinyl fan I'm used to a little noise underneath really great sound so this is not very distracting. It would be nice to fix though.