AVS Addicted Member
Join Date: Dec 2000
Location: Venice, Florida, USA
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The only consideration for placement here, disregard all advice regarding placement to obtain brightness v contrast,l which otherwise would be a consideration, is avoiding terrible hot spotting. A good rule of thumb and one that should never be violated is to mount with a throw ratio. screen width/throw distance (of course not mixing inches on top with throw in meters. Your screen is 131 inches wide, giving you a minimum throw (to avoid hot spotting) of 2.4 x 131 inches of about 315 inches. Converting inches to meters, that means slightly over 8 meters and you only have 7. TILT This is a no go. Go to a lesser gain screen or decrease the screen size. Gain is no free lunch and any angular reflective screen with a gain say higher than 1.3 will never let you forget that you are watching off of a reflective surface. There are lots of screen material choices out there with gains that will work quite nicely with you chosen screen size and placement throw options. Your projector has considerable lumens out power. To avoid hot spotting with a 150 inch D 1.78 1.3 gain, you need a little over 4 1/3 meters. Using that as a minimum, I would use a little over the Sony stated minimum of 4.47 meters (I would use minimum of 4.55 meters to be safe).
The Sony has a minimum throw ratio of 1.25. Go slightly longer and mount no closer than 1.3 times 131 if you end up with a 1.3 gain. Just remember to avoid hot spotting use a minimum of the gain factor times the screen width. This is for a white screen. If you end up with a gray with gain, you will need to go further away. The gain will be a number less than 1 for the gray substrate and a sorayed on coating to give you the positive. Thus the sprayed on coating will probably be around 1.6 ending up with an overall gain of say 1.25. Your minimum then would be the sprayed on coating value, usually around 1.6.
Last edited by mark haflich; 06-18-2014 at 12:50 PM.