Having read all the previous discussions and looked into other options I have decided to build a custom acoustically transparent screen for my home theatre.
The room is a 12mx6m 100-year-old barn that I have restored. It's built on stone walls 0.5m thick. I have an Acer H-5360
projector installed on one of the three beams that hold the roof structure. The image projected is 189" x 107" in 16:9 mode.Seymour's XD fabric
is out of the question since it isn't wide enough and does not stretch but a meager 1%.
I have narrowed my choices down to Dazian Coated Celtic Cloth
(CCC) and a combination of white Trapeze (be it standard
) and black Trapeze+
in a dual-layer combination as discussed in this forum.1) Dual-layer spandex: Distances.
My first question is with regard to the distances to be allowed between the left, right and center speakers (Onkyo SKS HT540
) located behind the screen.
I have gathered from this and other fora that a 4-6 inch distance should be allowed between the speakers and the screen. However, I haven't found any clear information on whether the black and white spandex should stand directly on top of each other. What should the distance be between the speakers and the back layer? How about the front white layer and the black back layer? As you can imagine these distances have implications in how I will be approaching the framing system.2) Dual-layer spandex: Fabric choice.
Secondly, I have to choose two from the following fabrics:
1) White front layer:
Option A) White 2-way stretch, Trapeze
in 120" width with a stretch ratio of 60% in width and 100% in length.
Option B) Alternatively, I could also use Trapeze ES
. However, this material has a 40% x 70% stretch ratio which would not be enough for my purposes (I'll explain next).
Option C) White 2-way stretch, Trapeze +
in 122" width with a stretch ratio of 50% in width and 90% in length.
2) Black back layer:
Black, 2-way stretch Trapeze +
in 122" width with a stretch ratio of 50% x 90%.3) Dual-layer spandex: Stretch ratios (independent and combined).
The question here is what stretch ratio would be ideal for each layer (both individually and while working together) and whether any benefits may be obtained from using another combination of fabrics different from the intuitively obvious choice of both black and white Trapeze +.4) Dual-layer spandex: Backing.
Furthermore, given that the screen will be placed on top of a limestone stone-wall (pointed with a white cement and lime mix), should there be a need for a backing behind the dual-layer screen that cover the whole are behind the screen but the speakers?5) Dual-layer spandex: Edge concealment and Amblone installation.
Lastly, give the different aspect ratios in different shows, movies, video-games, etc. how can be the building of the frame be approached taking into account the dual-layer construction? I'd like to be able to conceal any part of the screen that is not being used and, to further complicate matters, I'll be also installing an Amblone
LED lighting system. Bear in mind that VLC allows to shift the image projected upwards to the extent that the upper border of the film will coincide with that of a regular 16:9 projection so that the area to be dealt with aesthetically can be confined to the bottom part of the screen.6) Dual-layer spandex: 120Hz, HD 3D projection.
Finally, as a bonus question, what are the implications that such a screen would have on Nvidia 3dvision projections?
Thanks in advance for all the good advice you have provided already.