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In the realm of home theater systems “4K” is what “3D” was five or six years ago, and I mean that in the most pejorative way possible. Sure, 4K doesn’t require goofy spectacles or remind you of cheap 50s cinema gimmicks, and it even sounds sexier than 3D. But I have a hunch most people are confused about 4K and don’t even know it. We’ve reached this ridiculous place where even smart phones are getting 4K displays, and I want to ask you one simple question: Do you know what 4K means?