AVS Special Member
Join Date: Jul 1999
Location: San Jose, California, USA
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With any of the digital projectors (LCD, DiLA, or DLP) there is the possibility of a moire pattern caused by the mixing of the dot pattern with the pixel pattern. For this reason, perfed screens are commonly reccomended for analog CRT projectors but not digital projectors. There would appear to be people who do not experience this problem and use such screens with digital projectors, but be aware of the potential problem.
Also be aware that perfed screens are somewhat fragile - it is not uncommon to rip the material along a perf line when assembling one of the permanent stretch-over-frame screen types.
Finally, the perfed screens are better than they have ever been, but will never be 100% acousticly transparent. There is some loss of treble frequencies with all such screens - although if you have a multiband frequency equalizer for LF/Ctr/RF, you can tune this out. (Theaters use horn type speakers with "hot" treble to overcome such losses.)
Of course, the clear advantages of perfed screens are they conceal the front speakers and tie the sound to the screen very effectively. However, much additional thought needs to be put into the use of such screens to avoid or minimize the well-known issues.
I was strongly tempted by such screens, but in the end placing the screen all the way against the wall allowed a larger image size. The front and center speakers were placed under the screen, and since I had only one row of seating, I was able to make speaker stands which tilted the three speakers to aim directly at the listener's ears, taking advantage of the fact that directional hearing is 100% in the horizontal plane, you cannot distinguish vertical sound displacement unless the screen-to-speaker seperation gets really large.
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