Not all home theaters are created equal. While you can technically stick a screen on the wall and a projector on a table and call it a home theater, there is a very distinct difference in quality between a DIY home theater and a professionally installed system.+ Generally speaking, a home theater system is a combination of electronic components designed to recreate the experience of watching a movie in a theater. When you watch a movie on a home theater system, you are more immersed in the experience than when you watch one on an ordinary television.