The general rule for screen size is that you should sit at a distance of 1.5-2 times the diagonal screen size. So, if you have a 60" screen, you should sit 90-120 inches away (7.5 - 10 feet).
After you've laid out your seating during the planning stage of your basement, you'll know about how far away from the screen you'll be sitting. Use the rule above, or an online distance calculator to get a feel for the screen size you need.
When you go shopping to compare the different sizes and models, stand about the same distance as you'll be at home and find the size that suits you best.
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Approximate viewing distance
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Recommended screen size (approx)
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5-6 feet
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42"
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6-7 feet
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50"
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8-10 feet
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55"-60"
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12-15 feet
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65"-70"
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Note: These are just general guidelines, but remember- if you are much further than this away at a given screen size, you'll be losing some of the detail in that beautiful HD image!
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Since my basement plan has the main viewing area about 12 feet away from the screen, a 70" screen would be a good size. Even the seats at the back of the room would have a decent view of a screen that large. If I go with the front projector I'll have room for about a 100" screen- which will create a very immersive home theater experience!
