Join Date: Nov 2001
Location: Atlanta suburbs
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From talking to a lot of pro's during my research, most tend to recommend no larger than a 106" to 110" (diagonal) for the 10/11HT if your goal is a bright vibrant picture. Another concern is that the larger you blow up the picture, the greater the chance of being able to see the "screen door".
But, conditionally, sure, the 11HT can do 120". You may want to PM Gus. I think he's driving a 133" screen with the 11HT. Get his opinion on the pluses and minuses of a big screen and what screen material he used.
Once you get over 106" you really need to use your light as efficiently as possible. The difference between a 106" and a 123" is an additional 10 square feet (or 33% more surface area). You'll need to have complete control of the ambient light in your theater room.
For this size screen you will definitely want a screen with gain. You may want to consider either the StudioTek 130, the Ultramatte 150, and maybe the new FireHawk (or Da-Lite equivalents). One caveat about the FireHawk, it does have a more restrictive viewing angle than the other two.
All 3 of these screens will get you a foot-lambert level above 16 f-l with cinema black on and above 20 f-l with cinema black off (assuming 614 real-world lumens with cinema black on and 767 real-world lumens with cinema black off). Your goal should be to try and stay above 16 f-l. Your setup will be at least as bright as the movie theater but much less bright than a regular television. Fine for watching movies but maybe not so good for sports.
You may also want to consider a screen with a gain above 2.0, but in those cases, I'd call the mfg and get some pre-sale technical support. Instinctively I would say, for example, the Da-Lite 2.8 gain high power screen has too much gain for the 10/11HT, but I've seen postings where people are using it and say it works great. Personally, I would have thought it would be a mess of hot spots. Go figure.