I had a speaker buzz coming from my center & surrounds; it only occured when the pre was in pro-logic mode (stereo, mono, "stereo surround", Dolby Digital, and DTS modes were fine). I was able to reduce the buzz by placing a cheater plug on the pre (3 prong to 2 prong adapter).
I then placed a cheater plug on my Genesis Digital Lens and the buzzing vanished.
I would try cheater plugs first and then a cable ground isolator.
I then placed a cheater plug on my Genesis Digital Lens and the buzzing vanished.
I would try cheater plugs first and then a cable ground isolator.