Both are decoding systems for home theater sound. Dolby Digital is the successor to Dolby Pro-Logic. Pro-Logic is actually four channels of sound that is reproduced through five speakers. The four channels are: left, center, right and the left/right surround channels. In Pro-Logic mode the rear speakers are in mono. Pro-Logic is typically found on an analog source Ex: VCR tapes. Dolby Digital is a discrete digital system offering six separate channels of sound with a dedicated subwoofer channel for deep bass. The six channels are: left front, center, right front, left surround, right surround and LFE (low frequency effect) for bass. This is also known as 5.1 channel sound. Dolby Digital is the audio standard for DVD and HDTV. Dolby Digital offers greater dynamic range than Pro-Logic and improves the separation between channels.
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Audio Products:
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