What Is Dolby, DTS, and THX?
These are the different types of surround sound available. Dolby was the first surround sound manufactured. It was Dolby pro logic the rear speakers both produced the same sounds (mono). Then came pro logic 2 AND the rear channels were now separated. DTS Digital Theater Sound. It was originated for movie theaters. If you read the back of your DVDs you will see audio formats and if DTS is one of the choices select it you will notice the difference. THX was introduced by George Lucas (Lucas Films). It is a proprietary set up and requires specific speakers and receivers. They also offer certifications for installers.