Projector mounting question - AVS Forum
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post #1 of 4 Old 08-28-2014, 07:36 PM - Thread Starter
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Projector mounting question

My living room ceiling slopes from 10" feet to around 7 feet where my seating area and ceiling mounted projector is mounted. It's 12" feet from lens to 110" firehawk fixed screen. Becuase of this my projector lens is around 6'6 feet off the ground so it points at the screen and with just a little angle up and small keystone I have the image squared and what looks to be a focused image. In a perfect world I would have the projector higher then the screen but my room can't accommodate this. So what drawbacks or issues does this present?

Thanks for any insight.
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post #2 of 4 Old 08-28-2014, 09:41 PM
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What projector (brand and model, please) are you using?
If you're using a model with adjustable offset it won't do anything negative for the image (though some DLPs can have contrast raise or lower somewhat depending.

If you're using a projector that only has digital keystone correction you'll be losing and rescaling some of your resolution, especially at and near the top of the screen. The more noticeable negative is that straight vertical lines and shapes become a bit jagged and pixely-looking from the rescaling.
If you happen to be using a 720p projector that uses diamond shaped pixels instead of the usual squares this jagged look from rescaling doesn't seem to happen near as visibly.

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post #3 of 4 Old 08-28-2014, 09:53 PM
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If you are having to use digital keystone correction, you are throwing away the 1 to 1 pixel mapping and blurring your image.

You might consider tilting the top of the screen out from the wall so its surface is square to the projection light path again. Or lower the screen on the wall so you don't need to tilt the projector. Or swap your room around so the screen is on the 7' wall and the projector and seating are on the 10' wall. Acoustically, you would be better off with the seating under the vaulted end of the ceiling. The way you have it, sound from the front speakers is hitting the viewers twice -- direct from the speakers and again reflected off the ceiling a split second later.
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post #4 of 4 Old 08-29-2014, 04:31 PM - Thread Starter
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Quote:
Originally Posted by dreamer View Post
If you are having to use digital keystone correction, you are throwing away the 1 to 1 pixel mapping and blurring your image.

You might consider tilting the top of the screen out from the wall so its surface is square to the projection light path again. Or lower the screen on the wall so you don't need to tilt the projector. Or swap your room around so the screen is on the 7' wall and the projector and seating are on the 10' wall. Acoustically, you would be better off with the seating under the vaulted end of the ceiling. The way you have it, sound from the front speakers is hitting the viewers twice -- direct from the speakers and again reflected off the ceiling a split second later.
Thank you both for the replies.

This sounds like I need a pro installer. Anyone in Orange County,CA can PM me?
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