Projector to light a 150" screen

Discussion in 'Displays' started by Gunman606, Oct 15, 2013.

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  1. Gunman606

    Gunman606 Auditioning

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    I have an under construction theatre dedicated room that measures 15.5' x 33' with 9' ceilings. No windows. I feel I have the room for the 150' screen so the question is do I have the budget to light it. I’ll keep all the décor in the dark green flat and or blacks to control light…

    I'm thinking of the JVC DLA-X55R 4K 3D 1080P THX HOME THEATER PROJECTOR DLA-RS48U. I can get this for about $4k on ebay, I guess I can go up to about $6k. I budgeted another $1k for a screen.

    My last house had a 110’ Screen and I I really want the 150” (I built the room around this thought) so thoughts on projector and screen combo? Originally I was thinking of a 1.0 gain but after some research I’m thing to light the big screen maybe a 1.5 or…???

    If I’m way out of budget then I’ll wait and save more to get what is needed to the job. So thoughts????

    Thanks in advance!
     
  2. schan1269

    schan1269 HTF Expert
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    Your first decision should be if you want to go AT. At 110" having your center under the screen really isn't a problem. 150", then you get into where you almost have to be able to place your speakers behind the screen, especially at 9' ceiling.

    Make that decision first.

    Once you've made that decision then we can look into gain and FL you need.
     
  3. schan1269

    schan1269 HTF Expert
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    The JVC 55R will produce 18fl at a 15' throw on 150" at 1 gain. 1.5 bets you 26fl.

    Depending on your preferences...12-22fl is ideal.
     
  4. Type A

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    Welcome to the forum Gunman :)

    Your budget is great. Man can you imagine 26fl, in your entire field of view, viewed in a cave? That sounds just plain uncomfortable.
     
  5. schan1269

    schan1269 HTF Expert
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    I just used the calculatorpro real quick. I assume the 1.0 gain 18 is based on high power. So would the 26fl, but that would allow it to be run on low.

    Just conjecture on my part cause I didn't go any further into it.

    That and most AT are .8 to 1.1. (Is Seymour Center Stage* still the highest at 1.2?)

    *By the way, I would never buy a perforated AT screen. I always recommend woven. But woven are "light suckers".

    Woven examples are Elite AcousticPro(around a .9) and SMX CineWeave (1.15)

    My bad...Seymour is woven...I for some reason thought perf...
     
  6. Gunman606

    Gunman606 Auditioning

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    schan1269 I like the idea of the speakers up front to be hidden. I planned on building a false wall to hide them anyway so let's assume AT
     
  7. Gunman606

    Gunman606 Auditioning

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    schan1269 thanks for the time and thoughts... after reading your last post you don't think AT is the way to go··· If I mounted the 150" screen 6" from the top I would have 30" below for the center speaker, right? Not sure why that wouldn't work?
     
  8. Jim Mcc

    Jim Mcc Producer

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    For a 150" diagonal image, the closest the JVC 55 can be mounted to the screen is 15'-3". What will your throw distance be? Because the longer the throw, the dimmer it will be.The 150" screen will be 73" tall, but that does not include the size of the border. Assuming it's 2" on top and bottom, that's another 4" to deduct. So instead of 29" of space, you would have 25" of space. But that's still enough to put your center speaker under screen. You would just need to angle it up toward your ears.
     
  9. Type A

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    AT is highly recommended Gunman, theres no substitute for proper speaker placement. There are ways around it, angle the center up, use DSP trickery combined with height speakers ect, but this is not preferred. The only reason I dont have an AT is because I have plasma right behind my projector screen. If it was a dedicated room with just a projector screen I would have an AT. Sam was only instructing you on the differences between the different styles of AT and not discouraging AT in general but rather a certain type of AT.
     
  10. schan1269

    schan1269 HTF Expert
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    If you want your center sitting on the floor, fine.

    I however like my speakers where they are supposed to go...which is impossible without an AT screen at 150". (plus that gives you the opportunity to have all three speakers exactly the same)

    His room is big enough to have a 15' throw. Putting the screen 6" from the ceiling is a completely dumb move. I would put it 18" from the ceiling and floor(whatever you end up with after the "border"). Besides, not sure what projector can keep the image that high. Even if you flush mounted the projector, I still think you'd have a minimum of 10" off the ceiling.

    Don't know why "I have a plasma behind my screen so I couldn't do an AT screen" keeps being propagated as an issue. Every woven(and I would assume perf as well) AT screen has a "light bleed" fabric backing...if you'd need it.
     
  11. Type A

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    It has nothing to do with light bleed being an issue. In my specific application it has to do with maintaining a consistent vertical location for both displays (and close to eye level), owning all vertical-oriented speakers, using a 2.8 gain screen, and wall-mounting a plasma not being practical. You and I have had this conversation before so not sure why youre still struggling with it.
     
  12. schan1269

    schan1269 HTF Expert
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    It would help to add the caveat. My situation places my center under my 50" plasma as well, with the screen in front. The center is closer to the middle of the screen there, than it would be "on the floor".You aren't the first person(nor is this the only forum) where the myth of "you can't place a display behind an AT screen" is spilled forth.
     
  13. Gregg Loewen

    Gregg Loewen Video Standards Instructor, THX Ltd.
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    guys, these numbers are reasonably close to accurate:

    theater spec is 16 fL off an ungated PJ....14 with film in the light path.

    The JVC 55R will produce 18fl at a 15' throw on 150" at 1 gain. 1.5 bets you 26fl.
    Depending on your preferences...12-22fl is ideal.
     
  14. Gregg Loewen

    Gregg Loewen Video Standards Instructor, THX Ltd.
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    this is in no way a myth....usually
     
  15. schan1269

    schan1269 HTF Expert
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    True...but if a display is behind the AT screen, you plan for that. Just like you plan for everything else.

    You don't buy a Porche 911 and plan a high-speed track day in 110 degree weather and stop by your local Tire Barn and pick up snow tires.

    By the way, Know a guy who put a set of piano gloss white speakers behind an AT screen. That caused more problems than a LCD/plasma ever would...
     
  16. Type A

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    I should also add that its easier to correct for improper center speaker orientation than it is to correct for improper video orientation. Improper video orientation meaning either inconstant display heights and/or improper orientation relative to seating. In situations where numerous factors prevent a seamless dual display system, kinda like with my system goals and room limitations listed above, something like a "dialog lift" audio DSP can be highly effective for correcting improper center speaker orientation. The catch to this method being an additional pair of speakers employed above and wide of the mains. Certain processors also allow for dual room calibrations, one calibration can be for the projector screen down and another for plasma use. In this case even dialog lift is adjusted one setting higher for projector use than when used for the plasma because, obviously, the wider projector screen will also be taller. In a single display projection system an AT is a no-brainer (assuming they have the gain you want), but in dual display systems its not so cut and dry.
     
  17. Gunman606

    Gunman606 Auditioning

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    Thanks all for the info. So I now think I'll do the JVC 55R (18fl at a 15' throw on 150" at 1 gain) and this AT screen:
    [color=rgb(34,34,34);font-family:Arial, 'sans-serif';font-size:10.5pt;]
    [color=rgb(34,34,34);font-family:Arial, 'sans-serif';font-size:10.5pt;]http://www.projectorscreenstore.com/Projector-Screens/Elite-Screens-ezFrame-Series-150-Diag-74x131Fixed-Frame-Projector-Screen-HDTV-Format-AcousticPro1080P2-Fabric-R150WH1-A1080P2-69767.html[/color]

    I'm hoping this system at 150" would have as good if not better picture than my last system. I know the following is not the best to give an opinion on but in general what do you think? I sold my last home with the Theatre and I can't find the details on the last projector. It was also JVC costing about $5K the screen was 110" and bought 10 years ago... I'm thinking the advancements in technology over the last 10 years would give a good HD picture at 150" From what I read the 18FL at 150" on this projector should look great?[/color]

    So I guess what I'm asking is will I be happy with this setup at 150" or should I scale back the size look for better projector?

    I know a good bit more than I did when I 1st ask the question (I had to research what AT and FL stood for just to understand the answers, BLUSH) So again all thanks for taking the time to help, once done here I'm off to the audio boards. I hope to be up and running by X-mass!
     
  18. schan1269

    schan1269 HTF Expert
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  20. Gregg Loewen

    Gregg Loewen Video Standards Instructor, THX Ltd.
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    Gunman, as a professional installer and calibrator : THERE IS NOT A CHANCE IN HELL YOU WILL BE ABLE TO GET 18 fL out of this!!
     

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