Acoustically transparent projection screens let you put the voices where the action is.
When you see a movie in a commercial cinema, it's easy to suspend disbelief and pretend you're watching the action through a window. One important reason for this is the fact that the sound of the characters' voices seems to come from their apparent location, rather than from above or below the screen.
Need a good reason to buy a projector? How about this: Of all the video-display types, projectors provide the biggest image for your buck. Rear-projection TVs, which were once available in screen sizes up to 92 inches, used to be an even more affordable big-screen option, but the last manufacturer with a stake in rear-projector manufacturing, Mitsubishi, recently closed up on that biz.
Every once and a while I get an email questioning our choice of using a 100-inch screen to measure projectors. I feel this size is the best way to judge the performance of a projector, while at the same time offering you, our fair readers, a way to judge how bright the projector will be on your own screen.