Definition of: home theater   

An audio/video entertainment center that has a large-screen TV and hi-fi system with three speakers in the front (left, right and center) and left and right speakers in the rear. Starting in the early 1990s, video inputs were added to stereo receivers and preamplifiers. Today, almost all audio vendors make combination audio/video equipment for home theater listening and viewing.

Audio - Just As Critical
A good sound system is as important as the video display in a home theater setup, if not more so. In many home s, the audio is the more elaborate and costly portion of the system. Setting up the room for realistic audio can be a lot more challenging and time consuming than setting up the video, but the results are worth it.