![]() ![]() Pro Logic II came along later, and added the ability to split this signal amongst 5 speakers and a separate subwoofer. Pro Logic decoded the audio from a record, cassette tape or VHS movie and played it back over the two channels with the only variation in sound being left and right. Think 70s-style woodgrain cabinet-type speakers. Typically, the subwoofer was actually built in to the speakers it was designed for. The original format was designed to utilize two channels and sometimes a subwoofer.
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