Chart Distance x Screen Size - Standards SMPTE and THX - Page 3 - AVS Forum
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post #61 of 64 Old 04-16-2014, 06:35 PM
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I would recommend about twice the height of the screen = the distance from the screen. so a screen of no more than 2 meters tall. So about 3 meter across (not diagonal) would be about the largest I would attempt.

Speaker placement then becomes a challenge, of course, so people with that large a screen often get an acoustically transparent screen and place the speaker behind it. You can reach some of the discussions about that.

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post #62 of 64 Old 04-20-2014, 12:41 PM
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Quote:
Originally Posted by Peter_ View Post

http://www.thx.com/home/setup/display.html






Peter

Sorry, I still don't understand.

What I am looking for is, where on the wall do I put the screen?

If I am sitting back 6.5 feet, with a my eye height at 39 inches, the, THX recommended, top of the screen should not be higher than 60 inches? (tan 15 * 78 inches = 20.9, then rounded to 21. 21 + 39 = 60")

Am I doing it right?

(52" Sony LCD HDTV)

McIntosh Labs! What am I listening to?
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post #63 of 64 Old 09-30-2014, 12:03 PM
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i will have 2 rows of seating

what is the maximum and minimum distance for watching on a 120 inch screen with a 4k projector screen?
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post #64 of 64 Old 11-01-2014, 05:46 AM
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Quote:
Originally Posted by jrcrunch View Post
i will have 2 rows of seating

what is the maximum and minimum distance for watching on a 120 inch screen with a 4k projector screen?
If your screen is 120 inch diagonal 16:9, then your screen height is 58.8 inches.

Ultimately it's down to personal preference and comfort, so experimentation is the best way to find out how close you can comfortably sit for long periods with the screen you have at the height it is mounted - the closer you sit the greater the vertical viewing angle becomes. 15 degrees is the recommended vertical viewing angle for comfort, but 35 degrees is the recommended maximum, so there is leeway there.

As for a viewing distance 'range' for 4k, Sony recommend a 1.5 x Screen Height seating distance ratio for 4K, so to get the range you could approach it in one of two ways provided that you are watching 1080 upscaled to 4k since that currently all your source material is probably 1080, and I would think that would be the limitation from a source quality perspective.

Combine Sonys recommendation with THXs recommended range of 2.4 x SH (optimal) to 3.68 x SH (back row) which is based on viewing angles/immersion, and their front row limitation appearing to hinge on good quality 1080, to give you a range of 1.5 to 3.68.

Or reduce the back row by a similar amount as the front based on Sonys recommendation to give you something like 1.5SH 2.78SH.

But the closer seating distance will rely on good quality source material.

Having said that, THX have also said that they feel that a 60 degree viewing angle (2xSH) is probably too wide for films (this is also SPMTEs closest recommended seating distance), but I'm not sure if they are basing that on a comfort perspective (too much eye movement) or an image quality perspective. Maybe a combination of the two.

Considering you're using upscaled 1080 rather than 4k as your source material, that may ultimately determine how close you want to sit, so we're back to experimenting to see what works best for you.



HTH

Gary

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