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| | Home Theater Glossary |
 | | This term is also sometimes used as an abbreviation for amplifier. |
 | | In home theater use, DD uses up to 5.1 channels of sound consisting of left, center, right, left surround, right surround and a dedicated sub woofer channel. |
 | | Letterboxing: Video reproduction of a film that places the entire, uncropped picture on the TV screen-eliminating the pan-and-scan problems that result when a wide format is cropped to fit a 4:3-ratio (or even, in the case of extremely wide originals, a 16:9-ratio) screen. |
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