Dolby Pro Logic II
Surround sound for a new century
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by: Carol Mazur
Dolby Pro Logic II is the latest consumer product to come from Dolby Labs in the US. It's a multi-channel matrix method of processing standard surround sound and conventional Pro Logic movie soundtracks in a way that approximates true 5.1 channel performance. In other words it can make old movie recordings sound new and much better.
Pro logic II is an improved and enhanced adaptation of the early Dolby matrix circuitry. The new system offers left, right and centre front channels of sound and two rear surround or effects channels. It also offers a '0.1' channel subwoofer outlet, which wasn't feasible in the old surround processing format, via Dolby's proprietary Bass Management system.
Importantly, with Pro Logic II the rear surround channels are dedicated left and right channels, not a mono (summed) channel. They are also handle full range rather than the band limited (to 7kHz) chanel in the original circuit. What's more, the new steering decoders are independent for the front channels in Pro Logic II to create better sonic balance, directivity and sonic realisation.
Pro Logic II is backwards compatible with earlier Dolby products. It promises to deliver enhanced three dimensional sound from Early Dolby systems and does nearly everything claimed of it. What's more, it can be used to stunning effect to turn conventional density stereo compact disc music into an impressive multi-channel listening experience.
Like all technologies it's relevance can only be assessed by you personally, so look, listen and learn.
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