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You will able to perform this task from the web itself in a very comfortable way. In them, you can download different trailers of Dolby systems before you make a choice of which one suits better your home cinema system. What we advise you is to use Dolby Digital trailers and Dolby demo trailers HD section. However, you will able to tell the differences between some Dolby demo trailers HD and others. Now let’s give you some technical information of the different options available, without going to deepen much in the matter. Technical information about Dolby systems This additional channel creates the surrounding effect that gives a bigger sensation of auditory reality to the user. Dolby Surround sound format incorporates a third channel. By that time, it was a revolution and remained unaltered until the Dolby Surround format was released. To play stereo sound, a channel goes to the left ear and the other to the right. Until then, the sound used was stereo which only uses two channels. Pro-Logic sound system has been created by the Dolby Labs society. The sound format known as Dolby Surround appeared at the beginning of the eighties.