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post #1 of 16 Old 05-13-2020, 09:08 AM - Thread Starter
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Screen Size for JVC NX5

Hey, everyone. Not sure if this is the most appropriate spot to post this, but need some help and/or validation on screen size (probably a DIY). Purchasing a JVC NX5. Room size is 24dx16wx9h dark walls/ceiling bat cave.

I previously had a 1080p pj with a 120" 16:9 screen. This time around I want to go with a scope screen (~2.35-2.4). I will not have an A lens; I'll be zooming in to fill the wide screen.

Just want to make sure my logic and math is correct. Since I had the 120" before, I'd prefer for the non-zoomed 16:9 image to not be less than that size. (I used this calculator at projectorscreen.com for everything. If there's a better one I should use, let me know.)

For CIH based on a 120" 16:9 (~58.8" height), that equates to a 153" 2.40 screen. But, to fill the entire screen I'd need to zoom in to a 162" 16:9 equivalent right? Is that logic correct? See the attached images.

Assumption: AT Seymour Center Stage XD screen. Advertises 1.2 gain but from reading, real world is really ~0.95? If the logic above is correct, then a 162" with a throw of ~18'6" and 0.95 gain will produce ~21fL. Non-zoomed 120" 16:9 only gets brighter fL from there. The big question, personal preferences aside: is this bright enough for 4k HDR? Also, at this throw distance, its getting close to its fill zoom (1.85x of available 2.0x). Is that an issue? I could move it back as far as 22/23 ft throw if necessary, but then less brightness yeah?

Appreciate any insight. Feel free to educate me!
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post #2 of 16 Old 05-13-2020, 09:40 AM
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Quote:
Originally Posted by Chad Belletete View Post
Hey, everyone. Not sure if this is the most appropriate spot to post this, but need some help and/or validation on screen size (probably a DIY). Purchasing a JVC NX5. Room size is 24dx16wx9h dark walls/ceiling bat cave.



I previously had a 1080p pj with a 120" 16:9 screen. This time around I want to go with a scope screen (~2.35-2.4). I will not have an A lens; I'll be zooming in to fill the wide screen.



Just want to make sure my logic and math is correct. Since I had the 120" before, I'd prefer for the non-zoomed 16:9 image to not be less than that size. (I used this calculator at projectorscreen.com for everything. If there's a better one I should use, let me know.)



For CIH based on a 120" 16:9 (~58.8" height), that equates to a 153" 2.40 screen. But, to fill the entire screen I'd need to zoom in to a 162" 16:9 equivalent right? Is that logic correct? See the attached images.



Assumption: AT Seymour Center Stage XD screen. Advertises 1.2 gain but from reading, real world is really ~0.95? If the logic above is correct, then a 162" with a throw of ~18'6" and 0.95 gain will produce ~21fL. Non-zoomed 120" 16:9 only gets brighter fL from there. The big question, personal preferences aside: is this bright enough for 4k HDR? Also, at this throw distance, its getting close to its fill zoom (1.85x of available 2.0x). Is that an issue? I could move it back as far as 22/23 ft throw if necessary, but then less brightness yeah?



Appreciate any insight. Feel free to educate me!
How far do you plan on sitting from the screen?

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post #3 of 16 Old 05-13-2020, 09:48 AM - Thread Starter
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Originally Posted by skylarlove1999 View Post
How far do you plan on sitting from the screen?
Planning on 2 rows of seats with the 2nd being raised up. I'm open to suggestions, but 1st row maybe in the 10-12ft range and the 2nd at ~16ft or a set fixed distance from the 1st row.

Again, I have flexibility there. The entire room is pretty much a blank slate except for all the pre-wiring already done for the 7.2.4 setup, hence the AT screen.
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post #4 of 16 Old 05-13-2020, 10:01 AM
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Originally Posted by Chad Belletete View Post
Planning on 2 rows of seats with the 2nd being raised up. I'm open to suggestions, but 1st row maybe in the 10-12ft range and the 2nd at ~16ft or a set fixed distance from the 1st row.



Again, I have flexibility there. The entire room is pretty much a blank slate except for all the pre-wiring already done for the 7.2.4 setup, hence the AT screen.
We can all give opinions on screen size, aspect ratio and screen material. Since this is a clean slate for you I would not buy a screen until after you get the projector.

Play around with seating distance , screen size at different aspect ratios and projector placement so you can tell how loud the projector will be in low and high lamp mode.

For larger screen sizes the more lumens you really need to great HDR, although the dynamic tone mapping firmware update from October 2019 does make larger sizes at least a little more possible. The smaller your screen, the closer you can mount the projector and the more lumens you will send to your screen.

Since the NX5 doesn't have a filter for HDR you will be utilizing all the lumens in high lamp mode. Remember all the numbers from the calculator are with brightest mode. You may find you don't like the sound from the projector in high lamp mode.

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post #5 of 16 Old 05-13-2020, 10:37 AM
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Quote:
Originally Posted by Chad Belletete View Post
Planning on 2 rows of seats with the 2nd being raised up. I'm open to suggestions, but 1st row maybe in the 10-12ft range and the 2nd at ~16ft or a set fixed distance from the 1st row.



Again, I have flexibility there. The entire room is pretty much a blank slate except for all the pre-wiring already done for the 7.2.4 setup, hence the AT screen.
Don't let the fact that you already prewired for your LCR keep you tied to an AT screen . I know having the same three speakers the same for LCR with all tweeters at ear level is ideal but until they make a Studiotek 130 as an AT without any compromise in picture quality, I won't surrender video performance for slightly better audio offered by an AT screen.

You can always slightly move speakers. Consider what aspect ratio you will predominantly be viewing. I just recently inquired with Mike Garrett from AV Science about the Stewart Filmscreen Studiotek 130 in the new G4 version. I have attached a review from Kris Deering. Pricing was way more reasonable than why I had known previously about Stewart. Way more reasonable LOL. If you are going bigger the gain from the Studiotek 130 will certainly be appreciated. You date the projector but you marry the screen.

https://www.soundandvision.com/categ...screen-reviews

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post #6 of 16 Old 05-13-2020, 10:53 AM
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I have the NX7 but also had a 120" 16:9 screen. I just switched this week to a 138" ST130G4 2:40 screen. I did lose 6" in total height over the 16:9 screen but I feel more immersed in the wider screen. Same sitting distance as you. At my sitting distance even in the 2nd row I do not think I would want a larger screen and giving up those 6" when watching 16:9 content I honesty do not notice the loss.
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post #7 of 16 Old 05-13-2020, 11:19 AM - Thread Starter
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Quote:
Originally Posted by skylarlove1999 View Post
Don't let the fact that you already prewired for your LCR keep you tied to an AT screen ... I won't surrender video performance for slightly better audio offered by an AT screen... You can always slightly move speakers. Consider what aspect ratio you will predominantly be viewing.
Very true. I've been thinking about this already. L/R channel would be no problem. Center might present a challenge as I have a diagonal stud that could affect placement (see pic: right pre-wire is center channel). Movies and widescreen content will be viewed most, followed by "regular" TV (sports) in 16:9. Maybe 70/30 split. I want to optimize for 2.40 and the image quality. So yeah maybe this is the best route.

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Originally Posted by flyinrazrback View Post
I have the NX7 but also had a 120" 16:9 screen. I just switched this week to a 138" ST130G4 2:40 screen. I did lose 6" in total height over the 16:9 screen but I feel more immersed in the wider screen. Same sitting distance as you. At my sitting distance even in the 2nd row I do not think I would want a larger screen and giving up those 6" when watching 16:9 content I honesty do not notice the loss.
What throw distance are you? I forgot to mention that the only limitation on projector distance is that ~14' to ~16' is unusable due to pull down attic access. Can't mount to that But could build some type of slide/track system to push the pj forward/back the handful of times a year that access would be needed. Hmm.
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post #8 of 16 Old 05-13-2020, 11:22 AM
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I am right at 16' throw distance. That was as far back as I could go. For my 16:9 ALR screen that was the minimum throw distance for the screen. My Stewart had a couple feet to spare. Also,like mentioned above the ST130G4 is simply awesome in my opinion as well. I did not have an option for AT screens but had to mount my center below the screen but angles towards the MLP. Zero sound degradation and if I had a choice between the ST130G4 and a speaker below it or any other brand AT screen with speakers behind it, I too would accept the aesthetics of seeing the speaker to run this screen.

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post #9 of 16 Old 05-15-2020, 08:53 AM
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@Chad Belletete there's some variation on how bright the screen should be.

Generally the 15fL is recommended for SDR and ~21fL for HDR for the NX series. Lamps do loose brightness over time. Treating the room will make the screen appear brighter.

Projector Central calculator is for the brightest mode.

Take the screen size you're interested in and calculate the square surface:
http://screen-size.info/
https://www.draperinc.com/projection...alculator.aspx
https://www.calculatorsoup.com/calcu...calculator.php

The NX series is ~1000 lumens on Low lamp, ~1500 on High.

From 100% zoom (closest to screen) to 0% zoom ~27% brightness is lost.

Adjust for screen gain.


Personally I don't think the NX5 is bright enough for a scope screen larger than 115" with a 1.0 gain screen, with 100% zoom. Maybe 140" scope screen with a real 1.3 gain white screen.
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post #10 of 16 Old 05-15-2020, 09:17 AM - Thread Starter
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Thanks @noob00224

Since the original post, I've decided to not go with an AT screen. I want to get the best quality out of the NX5, so looking to buy or build a 1.1 or 1.3 gain screen. Also decided (I think) around a ~143" 2.40 scope screen (11ft wide x 55" CIH) which gives me a ~112" 16:9. Don't want to go smaller than that, hence scrapping the AT for a white screen with some gain.

Along those lines, if built, looking at:
  • Seymour AV Glacier White (in my budget)
  • Stewart StudioTek 130 G4 (haven't seen just material pricing, but sounds much more costly
  • Carl's Flexiwhite (doesn't sound as good as the 2 above? But the cheapest)

Any screen material options I am missing for a DIY? And since non-AT, would I still need a black backing?

Thanks all.
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post #11 of 16 Old 05-15-2020, 09:29 AM
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Quote:
Originally Posted by Chad Belletete View Post
Thanks @noob00224

Since the original post, I've decided to not go with an AT screen. I want to get the best quality out of the NX5, so looking to buy or build a 1.1 or 1.3 gain screen. Also decided (I think) around a ~143" 2.40 scope screen (11ft wide x 55" CIH) which gives me a ~112" 16:9. Don't want to go smaller than that, hence scrapping the AT for a white screen with some gain.

Along those lines, if built, looking at:
  • Seymour AV Glacier White (in my budget)
  • Stewart StudioTek 130 G4 (haven't seen just material pricing, but sounds much more costly
  • Carl's Flexiwhite (doesn't sound as good as the 2 above? But the cheapest)

Any screen material options I am missing for a DIY? And since non-AT, would I still need a black backing?

Thanks all.
Flexiwhite is 1.0. My estimate for 140" scope was with a higher gain screen. IMO you'll need all the brightness you can get. Brightness aside, the Stewart screen are of a higher quality.

I'm not aware of any white positive gain screens in a lower budget, even middle size budget. The only option is paint mixes. For that option create a new thread here:
https://www.avsforum.com/forum/110-diy-screen-section/

Can be applied on a wall or cheap white PVC screen.
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post #12 of 16 Old 05-15-2020, 01:22 PM
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Quote:
Originally Posted by Chad Belletete View Post
Thanks @noob00224



Since the original post, I've decided to not go with an AT screen. I want to get the best quality out of the NX5, so looking to buy or build a 1.1 or 1.3 gain screen. Also decided (I think) around a ~143" 2.40 scope screen (11ft wide x 55" CIH) which gives me a ~112" 16:9. Don't want to go smaller than that, hence scrapping the AT for a white screen with some gain.



Along those lines, if built, looking at:
  • Seymour AV Glacier White (in my budget)
  • Stewart StudioTek 130 G4 (haven't seen just material pricing, but sounds much more costly
  • Carl's Flexiwhite (doesn't sound as good as the 2 above? But the cheapest)



Any screen material options I am missing for a DIY? And since non-AT, would I still need a black backing?



Thanks all.
I am not sure that Stewart sells just the material. Seymour will sell just the material. I own the Glacier White in a 120 inch 16x9 screen. It is definitely not 1.3.

1.1 yes but not 1.3 . Very nice image and quality.

I am looking at upgrading to the Studiotek 130 G4 in a 137 inch 2:40 screen. Just need someone to buy my Seymour screen. I use the Epson 6050. Honestly just find a way to buy the Stewart. You don't want to be in my situation upgrading again within 2 years. In my defense Stewart price has become much more affordable in the last year. Reach out to Mike Garrett at AV Science. He can give you a quote so at least you know the comparative pricing.

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post #13 of 16 Old 05-16-2020, 12:59 AM
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Here is the best calculator I have found for using the zoom method but I see you decided to do a 16:9. Its still a great calculator for projector placement issue with all lens shift taken into account. Also has a great FL calculator included.

http://www.reviewtranslations.com/pr...ulator_en.html

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post #14 of 16 Old 05-16-2020, 06:34 AM - Thread Starter
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Here is the best calculator I have found for using the zoom method but I see you decided to do a 16:9.
Oh, no, I'm doing a scope screen 2.35. I only wrote up the 16:9 dimensions to know the equivalent of my zoomed in image needed fill the scope screen.

Great calculator! Love how it gives you an idea of the entire room setup.

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post #15 of 16 Old 05-16-2020, 07:20 AM
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Ok I switched from a 16:9 120" Diag Screen to a 2:35 125" Diag Screen with a NX7 and it worked perfectly for my HT. My goal is to purchase a Stewart ST130 G4 2:35, but I'm going to hold off for now, maybe next year, when the economy gets back on its feet.

Peace and blessings,

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post #16 of 16 Old 05-17-2020, 09:00 AM - Thread Starter
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Ok I switched from a 16:9 120" Diag Screen to a 2:35 125" Diag Screen with a NX7 and it worked perfectly for my HT. My goal is to purchase a Stewart ST130 G4 2:35, but I'm going to hold off for now, maybe next year, when the economy gets back on its feet.

Peace and blessings,

Azeke
Awesome. I ended up just ordering a Silver Ticket 142" 2.35. The standard white 1.1 gain. Not that I couldn't build a screen, but for the cost of the Silver Ticket ($420) and the time savings of not building, and its almost the exact size I was going to build (143" 2.39)... I couldn't pass it up.
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