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Well it has nothing to do with magnetic shielding but from what I read on a different thread by you, it may have to do with needing better shielding. To rule out the receiver as a possible suspect, run the DVD straight to the TV using the existing cable and for that matter also go from your cable box to the TV directly. If you still have the same problems, then you either have a defective cable or one that would benefit from better shielding. If that's the case, consider either going to toslink or going with a Belden 1694A or equivalent. Blue Jeans is a good place to pick that up.
Susceptibility to things like lights (fluorescents or halogens can be a bear due to ballast issues or switching resulting in EMI), a microwave oven, and dimmers, while not the rule, are not unknown. Sometimes it's a matter of just getting a quieter dimmer or replacing the ballast. Sometimes it's a matter of getting your HT on a different circuit breaker and other times one needs to reroute or go with a better shielded cable or toslink. The idea is to positively identify which part of your system is the culprit so you don't go replacing things that aren't broken.
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