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You can easily find various review sites online that give recommendations for how far from a TV you should sit. The recommendations are not based on the "space provided", but on your sitting distance from the TV, based on the Society of Motion Picture and Television Engineers (SMPTE), which recommends a viewing distance that creates a 30° field of view for a comfortable, general-purpose experience. This usually translates to a viewing distance that is roughly 1.6 to 2 times the screen's diagonal measurement (or about 2 times the width). For the SMPTE Distance Formula for a 16:9 TV, the maximum recommended distance is roughly 1.63 times the screen diagonal. A common rule of thumb based on SMPTE is to sit about 1.5 to 2 times the diagonal size away. Example Distances: 50" TV: is about 6.5 to 8 feet away 55" TV: is about 7 - 9 feet away 65" TV: is about 8 - 11 feet away 75" TV: is about 10 - 12 feet away. The goal is for the screen to fill 30° of your horizontal field of view, which balances immersion without causing eye strain. While SMPTE provides a standard for general comfort, other industry recommendations differ. THX (Cinematic) recommends a 40° field of view for more immersion, which typically means sitting closer—roughly 1.2 times the diagonal screen size. Depending on your visual acuity, for high-resolution 4K or 8K displays, viewers can often sit as close as 1 to 1.5 times the diagonal size without seeing individual pixels, though this may exceed the SMPTE comfort guideline. The SMPTE standard is widely considered the baseline for a comfortable, non-overwhelming viewing experience, particularly for mixed-use rooms like living areas. Note: For modern 4K TVs, many users prefer sitting closer (closer to the 1.2 times THX recommendation) because the higher resolution prevents seeing individual pixels...^Ivan.
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