My mains aren't shielded. From my experience, unshielded mains are much more common than shielded. I've heard that you need as little as a foot or so to protect your set, but I don't know how much faith I put in that and prefer a little more separation -- my unshielded left channel is maybe two feet from my direct-view set. I don't know of how much (if any) difference shielding makes with DLP or LCD projectors -- I suspect that it shielding isn't necessary for them, but I haven't scoped them out well enough to know for certain.

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