AVS Special Member
Join Date: Jul 1999
Location: Santa Clara, CA USA
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1)Perforated screens (like those in a real movie theater) allow the speakers to be placed behind the screen. This helps merge the sound with the picture, and helps if you have limited space, and can't fit speakers above, below, or beside the screen.
2)Traditional screen material is designed for a flat, even, surface for reflecting the projector's light to the viewer.
Different screen materials have different attributes that can help offset the shortcomings or different projectors with more brightness or a wider viewing angle, or different configurations.