why buy a home theater system? Overall versatility defines a good home theater system, considering the various audio and video formats, not to mention devices and the media they are stored in. A good home theater system can handle both Dolby Laboratories and Digital Theater Systems sound formats, as these sound formats implement different surround sound speaker output, complimenting home theater systems. A good home theater system also supports DivX and/or Xvid encoded media, as well as DVD, DVD-R, CD, and CD-R/W media formats.