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Projectors are used in dedicated home theaters, and these days there's something to fit every budget. Many of these systems can get a TV signal, deliver 3D images or access content from the Internet.
Projectors no longer need to be big hulking units. Most are small and can be easily mounted on a ceiling in the rear of the room or perched on a table top.
When mounting a projector on the wall, the closer to the screen, the smaller the resulting images. Ratios vary from unit to unit, but, for example, if the projector is 10 feet from the screen and can project an 120-inch image at that distance, then for every foot closer to the screen the projector is placed, the image size will be smaller.
Projectors don't transmit sound, so you'll need to connect your projector to speakers. For movie viewing, five-channel surround sound is recommended. This gives you five total speakers: two in front on either side of the screen, one in the center, two in the rear, and a subwoofer that transmits deeper sounds.