New bat cave build, need input PLEASE - AVS Forum
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post #1 of 14 Old 02-11-2010, 06:29 AM - Thread Starter
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Hey guys, noob here, but have been reading on/off for about a year. MyI'm looking for some help to determine where I need to mount my projector.

Room size is 15' W x 20' L x 9.5' H. Front and side walls are (were) block foundation, so will be dark! Seating will be at about 12.5' and 18'. Looking at getting the PTAE4000. I need help picking the right size screen and where to mount the projector. I'm at the point of running my cables etc, so I need to have an idea of where to place the electric etc for the projector. I am looking at a DIY screen using Seymour AT, hanging via french cleat. Size is also up for debate, but defininitely going 2.35 so probably somewhere in the neighborhood of 110x47 up to 120x51.

PLEASE insert your comments and recommendation!!!
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post #2 of 14 Old 02-15-2010, 06:11 AM - Thread Starter
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wow, 114 page views and no input....
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post #3 of 14 Old 02-15-2010, 06:47 AM
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I think that either screen size will work for you based on your seating distances and room size, so the final pick is somewhat subjective to what YOU want. Tape or hang sheets up to get an idea on screen sizes. Go to Projector Central and use their calculator for the AE4000 with your screen sizes in mind to find out how differenet proj throw distances will interact with zoom position, image brightness etc. I understand that 16fl brightness would be a good goal. Don't forget to plug in 1.2 for screen gain if using Seymour Center Stage HD. Each 0.1 increment of screen gain gives you about 1fl added brightness.

Also, keep in mind that if you plan to do CIH set-up for 2.35/1.78:1 aspect ratios with the AE4000's auto zoom function, that the lens of the projector must be within the top edge of the screen. That will factor into placement since odds are you will hang it/mount it somewhere within second row riser and you want to located it where people won't be bumping it with their noggins.
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post #4 of 14 Old 02-15-2010, 07:21 AM
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post #5 of 14 Old 02-15-2010, 07:31 AM - Thread Starter
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Dat tru
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post #6 of 14 Old 02-15-2010, 07:43 AM - Thread Starter
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Gotta do some more measuring tonite. Estimating that bottom of screen to be at 28", may have to adjust that to keep projector below top of screen
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post #7 of 14 Old 02-16-2010, 07:48 AM - Thread Starter
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Ok, got better dimensions now. Forgot to figure in earlier that I was going AT screen, and that brings the screen front a few feet. Definitely looking at going with 120" x 51" screen, but my seating positions are going to be at 10' for the front seats and 15' for the rears. Is that screen size too large?? Looks about right to me.
Next question is at what height should I mount the screen? I measure the front seats eye level to be at 38". The 1/3 guideline puts the lower edge at 21" off floor which seems way too low. I think it looks better at 28". This is a more doable height for me and seems to be a good match for the Panny. At my mounting distance of ~15' the calculator puts the Panny at 15Fl which should be plenty bright, but at 1.79 zoom. Is that too much??
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post #8 of 14 Old 02-16-2010, 08:41 AM
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At 10' front row I think you could easily go with a 10' wide 2.35 with the Panny 4000. You will definitely need to get the projector even or below the top of the screen if you are going to be zooming for 2.35. My 4000 is mounted about 3" above the screen and no amount of lens adjustments can be done to line up the picture when I zoom so when my perfectly lined up 16:9 adjusts to my 2.35 lens setting my picture is off by about 3"

I think when you get to the screen build you should hang the projector and test what size screen you can handle at 10'

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post #9 of 14 Old 02-16-2010, 09:01 AM
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I used this tool to determine the proper throw distance for your projector/screen combo.

http://www.projectorcentral.com/Pana...ulator-pro.htm
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post #10 of 14 Old 02-16-2010, 09:09 AM - Thread Starter
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Quote:
Originally Posted by W00lly View Post

At 10' front row I think you could easily go with a 10' wide 2.35 with the Panny 4000. You will definitely need to get the projector even or below the top of the screen if you are going to be zooming for 2.35. My 4000 is mounted about 3" above the screen and no amount of lens adjustments can be done to line up the picture when I zoom so when my perfectly lined up 16:9 adjusts to my 2.35 lens setting my picture is off by about 3"

I think when you get to the screen build you should hang the projector and test what size screen you can handle at 10'

AT OR BELOW, how many inches below is acceptable for the Panny 4K?
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post #11 of 14 Old 02-16-2010, 09:29 AM
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I'm not really sure it matters just as long as it is not above the screen if you are going to be zooming back and forth from 16:9 to 2.35 with mine being above the screen I have to use the manual lens adjustment to get it lined up between aspects. If you are going to be using a lens for 2.35 it would not matter if it was above the screen as your Height would not change. I myself at some point mite start using a lens as you do lose a bit of sharpness when zooming but the automatic aspect lens adjust is a pretty cool feature of the 4000 and I'm pretty happy with just zooming at this point.

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post #12 of 14 Old 02-16-2010, 09:39 AM
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Quote:
Originally Posted by madspeed View Post

AT OR BELOW, how many inches below is acceptable for the Panny 4K?

The Panasonic spec file for the 4k indicates that the measurement is from the CENTER of the lens, with the min/max dimension of the lens center to top of screen being 0" (meaning not above screen edge) and 3'11" down from it. That data is for a 120" diagonal screen. The 0" requirement doesn't change with screen size.
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post #13 of 14 Old 02-16-2010, 09:45 AM - Thread Starter
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Thanks alot guys, that helps a bunch.
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post #14 of 14 Old 02-16-2010, 09:59 AM
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Quote:
Originally Posted by W00lly View Post

At 10' front row I think you could easily go with a 10' wide 2.35 with the Panny 4000. You will definitely need to get the projector even or below the top of the screen if you are going to be zooming for 2.35. My 4000 is mounted about 3" above the screen and no amount of lens adjustments can be done to line up the picture when I zoom so when my perfectly lined up 16:9 adjusts to my 2.35 lens setting my picture is off by about 3"

I think when you get to the screen build you should hang the projector and test what size screen you can handle at 10'

Hey Scott...I'm just curious why you haven't dropped your proj another 3" and not have to deal with the issue? Maybe you're already at min headroom on your riser?
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