Ever since Thomas Edision invented the phonograph in 1877, the quest has been on to make the reproduction of sound as real as sound heard in its original environment. Today's surround sound technologies are just a continuation of this quest.
Dolby Pro Logic IIz processing is an enhancement that extends surround sound vertically and fills the space above and in-front of the listener. Dolby Prologic IIz offers the option of adding two more front speakers that are placed above the left and right main speakers. This feature adds a "vertical" or overhead component to the surround sound field (great for rain, helicopter, plane flyover effects). For more details, check out my article: Dolby Pro Logic IIz - What You Need To Know.
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