How big can I go before loosing too much quality - AVS Forum
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post #1 of 10 Old 03-09-2001, 10:26 AM - Thread Starter
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Current distance is to screen and screensice is about 1:1
In the new room I can move as far as 8m. or around 26 feet.
So distance is not the Problem.

Thanks for the reply

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post #2 of 10 Old 03-09-2001, 11:38 AM
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I believe the Barco 801 is 8inch CRTs. You probably are going to be limited by light output in terms of screen size.

I don't know the rule of thumb for 8inch units. A 7inch unit can light up an 80inch wide screen without working too hard.

I would suspect that you can probably go to a 96inch wide screen and it will still look good with 8inch CRTs. I would guess that past 120inches wide it will start to be "too big".

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post #3 of 10 Old 03-09-2001, 01:51 PM - Thread Starter
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Thanks a lot. I apresiate it.
It was something in that line I was thinking too.
I guess, that when the manual says: up to 240" that's only what's macanically possible.

Has anybody experiense in those huge sices??

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post #4 of 10 Old 03-09-2001, 09:00 PM - Thread Starter
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Hi there.

Just joined the real world of Home Theater.
I have bourght a BG 801s with 750 hours on the clock.
In my current room i use a 70" / 180 cm. Wide 4:3 Dalite 1.3 gain screen, wich I think results in a very good picture.

Now I have the opertunity to move into a lot bigger room, and therefore I would like to go for a bigger screen.
The question is: How big can I go before loosing too mouch "punch" in the picture. I was thinking on a higher gain to compensate. But as I said. I'm quite new in this, so any insight will be appresiated.

Regards

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post #5 of 10 Old 03-09-2001, 09:56 PM
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Part of it would depend on the source material. Any problems in the source are going to be more evident as you move larger unless you also increase the seating distance. If you watch a lot of NTSC video, especially.

How far from the screen is your current seating and how far are you planning in the new space?
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post #6 of 10 Old 03-11-2001, 05:47 PM
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With 8" tubes, I would not go over 84" wide. The image gets real dark after that. If you change to higher gain screens, the image will be brighter in the middle when compared to the edges. This hot-spotting is very distracting, especially on screens over 1.5 gain.

Remember also, the larger the screen, the faster you "burn" out the phosphors on the tube.

[This message has been edited by Jon S (edited 03-11-2001).]

If it's not a BIG screen, it's not a theater...
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post #7 of 10 Old 03-12-2001, 06:06 AM
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I have a Draper 120in M2500 Screen with a NEC 9PG (Brand New Tubes) It looks very nice at 120 inches "but" in dark passages you will notice the problems you will have with a large screen. The lack of detail in dark passages makes you and your guests say, "Can anyone tell me whats going on, I can't see anything?" This is something to avoid when entertaining guests. Don't crank up your light output on a CRT to compensate for the lack of light. Be happy with a 100" screen - really, its a huge screen size. My advice, do not get carried away with screen size its not worth it, when it comes down to people praising your HT setup it will come down to quality.

Cheers,

Lee

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post #8 of 10 Old 03-12-2001, 11:54 PM
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I had a 138" Draper M2500 screen. First with a FPTV with 7" CRTs, and later with a FPTV with 9" CRTs. If you set a cap on the brightness and contrast being set to the standard factory settings, then you don't have to be overly worried about CRT burn-in or premature CRT failure.

But I agree with Lee that you can only get so big with a CRT FPTV before you take some hit in picture quality.

With my FPTV with 7" CRTs you needed an absolute pitch black room to get a good looking picture, and as he mentioned, even though bright movies like A Bug's Life would always look good, movies with dark scenes would turn black, and you would have to strain to see any shadow detail.

The extra light output of my FPTV with 9" CRTs helped a lot with the extra brightness bringing more life to the picture with better color and detail.
But the additional light showed off the downside of the high gain screen with more pronounced hotspotting and color-shifting.

Also, as it was mentioned, NTSC video does not show up well on a really big screen.

Overall, I'd also recommend keeping the screen size under 96" wide because you can go with a lower 1.3-1.5 gain screen with less hotspotting and colorshifting problems. Try and take the time to find some place local that has a high gain screen that you can look at with a variety of video material to see if the shortcomings of a high gain screen are worth it in trade for the larger screen size.

The larger, high gain screen was actually worth it for me, but I'd say that more than half of the videophiles would be bothered by the hotspotting, although most casual visitors had no problems with it. but you really have to judge the picture quality with your own eyes.

-Dean.
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post #9 of 10 Old 03-14-2001, 01:06 PM
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I own a NEC xg135lc and show it on a 107" x 60" Stewart screen. When I first got the screen, I specified the Ultramatt 2.0. However, while it looked good in most scenes, there was obvious hot spotting and some color shift in certain scenes. Following several discussions with Don Stewart, I exchanged the screen for a Studiotech 1.3 of the same size. The hot spotting and color shift are gone and the picture has never looked so good. I did not have to increse contrast and actually reduced brightness slightly. I run 60 on contrast (factory default is 75)and brightness is 61.
Don said that with the 1.3 gain screen, the perimeter of the picture will actually appear brighter than with a 2 gain due to better light dispersion and he was right. The only thing I might do differently if starting over would be to maybe go to a 96x54 size to pick up a little more sharpness. But picture quality is, IMO, excellent as is.
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post #10 of 10 Old 03-15-2001, 01:29 PM
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Boy we are going to run the gamet here but I guess that is what asking opinions is about.I had one Runco 980 ultra on a 107x60 Sewart Videomatte with 2.0 gain and as was mentioned the problems arises in darker scenes. You just feel like you wish you had more light. Now I have two projectors stacked and still use the 2.0 gain screen. For me the extra light output from the screen and stack are really the difference to getting a more engaging image.It is true that the center is brighter. Based on my experience I wouldn't go even up to 107" wide with that screen gain and one projector.

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