I have the same problem with buzz, though it only effects the left channel of my stereo system for some reason. This seems to be a relatively common problem with various work arounds like not using the HDMI output of the HD-DVR or bypassing the electical ground. What I can't figure out is why that is so. Time Warner here in San Diego doesn't seem too concerned that their cable system is causing the problem - which makes me wonder it AT&T uVerse could do a better job.
grounding issue
i am having some major hum with my jolida 302 b. when i have my phono hooked up there is no hum, but when i try to hook up my DVD/SACD/CD player i get terrible hum. however if i plug my ipod into the same connection via RCAs i get no hum. i am wondering if i am not grounding the DVD player properly. actually its not grounded at all i dont think. my system is a MMF 2.1 into a bellari 129 into the jolardi 302b. the dvd player is plugged directly into the jolardi with relatively high end cables. like i said the ipod plugged into the same input with terribly cheap RCAs makes no hum. thoughts?
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