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SurroundSound, also known in the newer format of Dolby AC-3. This is one of the newest methods of delivering surround sound into the home. By using special digital coding techniques, Dolby AC-3 delivers six discrete tracks of audio (often called 5.1 channels) from one digital signal. These discrete channels are Left, Center, and Right in the front, Left and Right Surround, and a Low Frequency Effects (the 0.1) channel to provide the extra boom found in many action films. A powered subwoofer typically creates this sound.
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