Our high-def team has prepped Amazon.com's High-Def 101 section with tips about setting up a home theater, but the one thing I believe is missing from every page in our guide is the following sentence in all-caps, bold, and italic text, repeated over and over: Make sure that your HDTV is receiving high-def content.

We don't do that, of course, as to not be rude, but it's still among the most common problems in HDTV setup. There are many reasons why people aren't actually watching their favorite shows and programs in high def, whether they've connected the wrong cables, forgotten to upgrade their set-top boxes, or merely chosen the wrong channel. Depending on what you watch, you might not even notice, especially if your favorite programs aren't on high-def-capable channels. But a resounding number of American households are in for a serious high-def test this weekend--this Sunday, come to think of it.

So whether you're a football fan who finally upgraded for Sunday's big game, or an HDTV pro who is watching the game on a buddy's brand-new 4,000-inch screen, chances are you might run into a set that isn't actually receiving the game (and its zillions of commercials) in high def. In either case, I recommend printing off this handy game-day high-def guide at Engadget HD, which will help you ensure that what you're watching, wherever you're watching it, looks as crisp and clear as possible come Sunday evening. And once the game's over, don't forget to fine-tune your entire home theater with the tips and guides at Amazon's High-Def 101--though, sadly, our guides won't help you figure out what to do with all of those uneaten game-day Funyuns. --Sam

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