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rssimm
Joined: 28 Jul 2009
Posts: 48
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| Posted: Wed Jan 20, 2010 5:30 pm Post subject: marquee projector mounting |
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wife gave me the tentative ok to convert the spare room into a theater. the total length is 13 feet. i will have to mount it with the back with in a couple of inches of the wall. i already understand that servicing will be a PIA. my questions are can the projector be mounted with the rear raised to the point that the tube faces are perpendicular to the ground and parallel with the screen? it will be on a shelf feet down. and is there a calculator to figure screen size based on throw? i know it is normally done the other way but im trying to give my wife the front room back and get a semi dedicated theater in the process.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Wed Jan 20, 2010 6:14 pm Post subject: |
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You need at least 12-14 inches behind the PJ, if you cant mount it there then forget it, you need to be able to pull out the CLM and VIM for any maintenance or repairs.having the tube face perfectly parallel whit he screen is the best way, it would be at a hight right at the center hight of the screen. This will have no keystone and a perfect square
raster on the tube face.
But you need room behind the PJ.
Athanasios
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rssimm
Joined: 28 Jul 2009
Posts: 48
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| Posted: Wed Jan 20, 2010 6:25 pm Post subject: |
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is removal of the VIM or CLM needed other than for repair or upgrade? i'm willing to move the projector when necessary if this the only time it's needed. unfortunately the layout of the room requires the tight rear mounting. the only other idea would be to vertically mount it and use a mirror. if i go this route is there any thing special i need for the mirror to look for?
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Jan 20, 2010 7:23 pm Post subject: Re: marquee projector mounting |
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| rssimm wrote: | | my questions are can the projector be mounted with the rear raised to the point that the tube faces are perpendicular to the ground and parallel with the screen? it will be on a shelf feet down. and is there a calculator to figure screen size based on throw? i know it is normally done the other way but im trying to give my wife the front room back and get a semi dedicated theater in the process. |
no you can't have the PJ up in the air and sitting on it's feet. If you don't want it on a table in the middle of the room then you'll have to do a proepr ceiling mounting.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Wed Jan 20, 2010 7:33 pm Post subject: Re: marquee projector mounting |
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| draganm wrote: | | rssimm wrote: | | my questions are can the projector be mounted with the rear raised to the point that the tube faces are perpendicular to the ground and parallel with the screen? it will be on a shelf feet down. and is there a calculator to figure screen size based on throw? i know it is normally done the other way but im trying to give my wife the front room back and get a semi dedicated theater in the process. |
no you can't have the PJ up in the air and sitting on it's feet. If you don't want it on a table in the middle of the room then you'll have to do a proepr ceiling mounting. |
Why Not drags? If the shelf is at the same hight as the middle of the screen and you lift the rear of the PJ it will be perfect and have no keystone. I tried this when i got my First M8000. it worked fine and actually the best set up I had.
I think it would be just above the viewers head, maybe 12-18 inches , youd have to be careful sitting and getting up each time, It also depends on how High on the wall he mounts the screen, My screen was a roll up so I was able to have the top of the image about 4 inches from the ceiling, it all depends on what your looking for.
First we need to know screen size, if it is small then it wont matter then since he'll have to mount it ceiling then with no shelf.
I am taking a guess this is the OP first CRT, the throw distance for CRT's are much less than Digitals.
So put his lens at about 10 feet to compensate for PJ size and some space behind to make connections he could have about a 8-9 foot screen at most.
Athanasios
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Wed Jan 20, 2010 8:01 pm Post subject: |
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I was using a Marquee in a short room like this before. I ceiling mounted the Marquee on sliding rails so most of the time is was only a few (3") away from the back wall, but when I needed to work on it I was able to slide it about a foot closer to the screen giving me room to pull the VIM out.
This was a nice setup but it may not be feasible unless you, or a friend have machining, and welding capabilites to build a custom mount.
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rssimm
Joined: 28 Jul 2009
Posts: 48
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| Posted: Wed Jan 20, 2010 10:04 pm Post subject: |
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fabrication skill are not an issue. my other hobby is rockcrawling so i'm adept at metalwork and welding. according to the calculator when i punch in my estimates for screen width and work backwards with my estimated throw distance i can get 94" wide using the straight line figure wider if i use throw and set the projector angle to 0. yes this is my first projector but i'm a quick study once i get hands on. the location of the projector will be partially in a closet that will also double as the equipment room. as this is my first projector i was hoping not to vertically mount this. although it looks like i could mount the whole system in the closet and it would allow me to move the primary seating back possibly a foot and open up the possibility of a wider screen.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Jan 20, 2010 10:45 pm Post subject: Re: marquee projector mounting |
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| Nashou66 wrote: | | Why Not drags? If the shelf is at the same hight as the middle of the screen and you lift the rear of the PJ it will be perfect and have no keystone. I tried this when i got my First M8000. it worked fine and actually the best set up I had. |
that's not really a ceiling mount then, it's wall mount with the PJ just barely above the heads of seated viewers. even then the screen would wind up really high on the wall
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rssimm
Joined: 28 Jul 2009
Posts: 48
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| Posted: Wed Jan 20, 2010 11:35 pm Post subject: Re: marquee projector mounting |
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| draganm wrote: | | Nashou66 wrote: | | Why Not drags? If the shelf is at the same hight as the middle of the screen and you lift the rear of the PJ it will be perfect and have no keystone. I tried this when i got my First M8000. it worked fine and actually the best set up I had. |
that's not really a ceiling mount then, it's wall mount with the PJ just barely above the heads of seated viewers. even then the screen would wind up really high on the wall |
this is what i don't want. why can't the lenses be parallel to the screen in either position? doing this will remove keystone and allow me to maximize raster.
it might be possible to fab a mount to allow the projector to tuck up into the upper closet allowing seating under the lenses.
if i flip the projector would i then have to worry about the height of the screen being to low?
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Wed Jan 20, 2010 11:50 pm Post subject: |
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As you lower or raise the back of the PJ so you don't have keystone the image moves up or down and usually to high or even over lapped on the ceiling or floor depending on how close to have it to either. The only place to locate the PJ so you have the lens parallel is dead smack center of the screen. otherwise there has to be some tilt.
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
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Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
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rssimm
Joined: 28 Jul 2009
Posts: 48
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| Posted: Thu Jan 21, 2010 12:25 am Post subject: |
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| Nashou66 wrote: | As you lower or raise the back of the PJ so you don't have keystone the image moves up or down and usually to high or even over lapped on the ceiling or floor depending on how close to have it to either. The only place to locate the PJ so you have the lens parallel is dead smack center of the screen. otherwise there has to be some tilt.
Athanasios |
ok i get this, thanks for entertaining my some what eccentric ideas. by design the projector is built to be mounted below(relative to the top of the case) the image.
i think this will work for my planed room.now to figure out projector height to seating height.
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Thu Jan 21, 2010 12:27 am Post subject: |
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My 9500LC is right up against the back wall. It has to be in order for me to fill my 8 foot wide screen. But I installed a pulley system
in the attic, connected to the mount, and I have a 4:1 mechanical advantage with it, so I can raise and lower the PJ all by myself,
although it does go a lot easier with a friend helping. I have to do the raising and lowering from inside the attic. Everything is solidly
braced and it only takes about 50 pounds of pull to move the projector. I can easily manage that one handed.
CJ
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Thu Jan 21, 2010 2:01 am Post subject: |
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| rssimm wrote: | | ok i get this, thanks for entertaining my some what eccentric ideas. by design the projector is built to be mounted below(relative to the top of the case) the image. . |
right, the tubes are angled at 15 dgeree's relative to the bottom of the machine where the mounting holes are. Look at PDF page 19 (section 2.4) and it has a good diagram of angles relative to screen and bottom of machine. Your mounting method would be something like Rear screen/floor mount but even then it's too low.
http://www.curtpalme.com/docs/ElectrohomeMarqueeUltra8500_8500LC_9500LC_User.pdf
| rssimm wrote: | | i think this will work for my planed room.now to figure out projector height to seating height. |
You can mount the PJ to the bottom of an 8 foot ceiling and sit under it comfortably without ever bonking your head.
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