Advice needed on screen size calculation with angled ceilings - Home Theater Forum and Systems - HomeTheaterShack.com

Old 04-25-13, 10:42 PM Thread Starter
Shackster

Join Date: Nov 2012
Posts: 13
Advice needed on screen size calculation with angled ceilings

Trying to figure out how large of a screen I can fit. The geometry is a little weird becasue it's a finished attic and the roofline "cuts off the corners".

Here's a photo (ignore my mocked up fake skylights - those will come later).

The flat part of the ceiling is 7' 9" if you couldn't read it. I'd love to get a 120" diagonal screen but a friend who's into home theater thinks it will be too low to the ground and not look good. I can ceiling mount the Epson 3020 (doesn't have lens shift) anywhere between 11-15ft. back. So throw distance shouldn't be a problem.

My question is this: how do I figure out how much lower the screen will have to be due to the angled ceilings?

120" screen would be 110" actual width (104" with 3" border) and 65" in actual height. Flat ceiling is 93" across. I have a difference of 17" or 8.5" on each side. How much lower will I need to go to get that 110" (actual) width?

Any thoughts or suggestions appreciated. Or do I just need to look at a 110" diagonal screen?
wackychimp is offline

Old 04-26-13, 03:56 PM
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Quenten

Join Date: Jun 2007
Location: Tallahassee, Florida
Posts: 2,349
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Re: Advice needed on screen size calculation with angled ceilings

I don't think it matters in the end. You will have to decide based on asthetics since the distance is fine for that size screen. It's going to be a matter of what looks good to you.
Tonto is offline
Old 04-28-13, 08:47 PM
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Don

Join Date: Oct 2007
Location: Central PA
Posts: 3,772
Re: Advice needed on screen size calculation with angled ceilings

I agree with Tonto. There are several calculators to help you stay within "suggested" norms for screen size, viewing angle etc. (I believe links are at the bottom of our Sticky), but the final determination is always personal preference. I would suggest actually projecting an image on the wall and then adjust positioning until you get the image you like.
Harpmaker is offline
Old 04-30-13, 10:38 AM Thread Starter
Shackster

Join Date: Nov 2012
Posts: 13
Re: Advice needed on screen size calculation with angled ceilings

Quote:
Harpmaker wrote: View Post
I would suggest actually projecting an image on the wall and then adjust positioning until you get the image you like.
Uh...How... how did I not think of this?

I'll get the projector out this weekend and try to get it as close to the ceiling as possible to see what it looks like.

Thanks!
wackychimp is offline
Old 04-30-13, 01:24 PM
Elite Shackster
Quenten

Join Date: Jun 2007
Location: Tallahassee, Florida
Posts: 2,349
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Re: Advice needed on screen size calculation with angled ceilings

Nice, can we get some pics so we can see it also?
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Old 04-30-13, 08:40 PM
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Don

Join Date: Oct 2007
Location: Central PA
Posts: 3,772
Re: Advice needed on screen size calculation with angled ceilings

Quote:
wackychimp wrote: View Post
Uh...How... how did I not think of this?
No worries... it's easy to get caught up in all the numbers until you can't see the forest for the trees.

I see the advice you got on another forum didn't mention this technique either.

Quote:
I'll get the projector out this weekend and try to get it as close to the ceiling as possible to see what it looks like.

Thanks!
You are more than welcome! If you have any more questions feel free to ask.

Are you thinking of using a commercial screen or going DIY?

If you intend on having all those skylights someday and want to view your screen in the daytime I suggest mounting your PJ as close to the screen as possible to get the brightest image. It takes light to fight light.
Harpmaker is offline
Old 05-01-13, 10:41 AM Thread Starter
Shackster

Join Date: Nov 2012
Posts: 13
Re: Advice needed on screen size calculation with angled ceilings

The skylights are actually intended to be faux skylights with a fiber optic star field in them. I'm not putting in real skylights so I'll be in control of lighting at all times.

I'm leaning towards a Screen Innovations Lunar Gray Screen because I plan to watch sports with friends too and want to have some lights on.
wackychimp is offline
Old 05-01-13, 11:43 AM
Moderator Emeritus
Don

Join Date: Oct 2007
Location: Central PA
Posts: 3,772
Re: Advice needed on screen size calculation with angled ceilings

Quote:
wackychimp wrote: View Post
The skylights are actually intended to be faux skylights with a fiber optic star field in them. I'm not putting in real skylights so I'll be in control of lighting at all times.
Ahhh, sounds cool! Not having to deal with gobs of ambient light will give you much more leeway in positioning your PJ.

Quote:
I'm leaning towards a Screen Innovations Lunar Gray Screen because I plan to watch sports with friends too and want to have some lights on.
I've never seen that particular screen, but from it's published specs it sounds great for your situation.
Harpmaker is offline
Old 05-02-13, 12:36 PM Thread Starter
Shackster

Join Date: Nov 2012
Posts: 13
Re: Advice needed on screen size calculation with angled ceilings

SO GLAD I TRIED THIS OUT! Thanks for the suggestion!

Here are the screen sizes in question along with a max screen size of 138". Is there anything I'm not considering here? Seems like I'd still have room for the front speakers. This was set up on a box on a table and was about 6ft. off the ground and roughly 15ft. back. Plan is to hang it though and I'm not sure is that matters. (Oh and the ceiling fan is history. Just haven't taken it down yet.)

Thoughts?

Thanks!
wackychimp is offline
Old 05-02-13, 02:01 PM
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Don

Join Date: Oct 2007
Location: Central PA
Posts: 3,772
Re: Advice needed on screen size calculation with angled ceilings

This is where things get very subjective. Unless you really want to go as big as you can get, the 120" would probably be the best compromise; especially if you intend on using 3D much (the image produced is darker).

Don't forget to allow space for a frame border.
Harpmaker is offline

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