We are a globally recognized innovator of sound, image, and voice technologies for cinemas, home theaters, PCs, mobile devices, and games.
Careers at Dolby
The Dolby Theatre
The Magic Inside Dolby
The Dolby Institute
Dolby in the Cinema
Dolby works with your favorite filmmakers and movie theaters to create a multidimensional cinema experience.
Dolby Surround 7.1
Solutions for Distributors and Exhibitors
Find Local Theatres
Dolby at Home
Transform your living room into a sophisticated home theater with amazing sound and true-to-life video quality.
Dolby Digital Plus
Home Theater Setup Guide
Speaker Setup Guide
Home Theater Products
Solutions for Broadcast Professionals
Dolby on the Go
Mobile devices with Dolby technologies dramatically improve your audio quality.
Drivers and Codecs
Solutions for Mobile and PC Professionals
Dolby at Work
Improve productivity by transforming the conference call into an in-person meeting experience with Dolby Voice and the Dolby Conference Phone.
Dolby Conference Phone
Partners and Professionals
Find Dolby solutions, services, and support that can help you create more engaging products, content, and entertainment experiences.
PC and Mobile
Dolby Pro Logic IIz introduces the dimension of height to your audio playback, making the sound you hear from your movies, TV shows, and games more spacious and true-to-life.
Dolby® Pro Logic® IIz introduces two front height channels to expand the possibilities for surround sound in your home theater.
The addition of height to the traditional surround sound setup creates more depth and dimension for an audio experience closer to real life.
The flexibility built into Dolby Pro Logic IIz provides you with a wide range of choices for speaker positioning to optimize the sound in almost any room.
Dolby Pro Logic IIz identifies and decodes the spatial cues in any type of content—stereo, 5.1, or 7.1—and then directs certain effects and ambient sounds to the front height speakers.
The addition of height channels opens up new possibilities for home theater sound.
Conventional 5.1- and 7.1-channel surround sound systems deliver a horizontal soundfield—sound is directed at you from only one vertical plane. Dolby Pro Logic IIz adds a pair of speakers positioned above the front left and right speakers to create front height channels. The result? A surround sound experience with more depth and dimension, and one that more accurately represents the way you hear in everyday life.
With Dolby Pro Logic IIz, rain in a movie sounds like it’s actually falling on your roof. A concert video in Dolby Pro Logic IIz sounds more like an actual performance—think of the stacks of speakers that frame a concert stage, or the tiers in an orchestra.
Most surround sound solutions use digital signal processing (DSP) to artificially model listening environments. Expanding on proven Dolby Pro Logic IIx technology, Dolby Pro Logic IIz identifies and decodes spatial cues that occur naturally in all content—stereo and 5.1 broadcast, music CDs, DVDs, 5.1- and 7.1-channel Blu-ray Discs™, and video games. It then processes ambient sound and certain amorphous effects such as rain or wind and directs them to the front height speakers.
Movie and game producers can even mix specific height channels into a soundtrack, and Dolby Pro Logic IIz will faithfully reproduce the vertical placement of those sounds. That means you’ll hear lifelike sound that comes at you from varying heights, compelling you to follow the action with your eyes and ears—above, below, and all around you—precisely as the producers intended.
By expanding the soundfield vertically, Dolby Pro Logic IIz lets you create a 7.1-channel playback system from your 5.1 surround system, or a 9.1 system from your 7.1-channel setup. Dolby Pro Logic IIz even makes speaker positioning and wiring easier.
How flexible is Dolby Pro Logic IIz? If you already have a 5.1-channel system and buy a new 7.1 A/V receiver with Dolby Pro Logic IIz, you can put the two additional speakers above your left and right front speakers for 7.1 height, or at the back for a traditional 7.1 setup.
Or you can stay with 5.1 channels and use the extra amplifier channels for stereo speakers in another room. With a 9.1-channel setup, you have even more choices, including state-of-the-art 9.1 playback with both surround and back speakers and two front height speakers.
Dolby Digital Plus™ delivers a definitive surround sound experience for all your devices from home theaters to smartphones.
Dolby Pro Logic IIz expands the audio possibilities and flexibility of the home theater by adding two front height channels, increasing the realism and depth of home theater audio. Based on extensive listening research and proven Dolby technologies, Dolby Pro Logic IIz works with all types of content—movies, music, TV, and games.
Dolby Pro Logic IIz incorporates all of the features and capabilities of Dolby Pro Logic IIx. The following information summarizes existing Dolby Pro Logic IIx implementations and what’s added for Dolby Pro Logic IIz.
The features listed above allow Dolby Pro Logic IIx to provide a true surround sound experience from a variety of sources. However, all the outputs derived by existing Dolby Pro Logic IIx decoders are located in a horizontal plane. The Dolby Pro Logic IIz extensions to Dolby Pro Logic IIx allow it to derive height channel outputs that significantly enhance the spatial experience.
In addition to the features already described, the height extensions offer the following new features and configurations:
Note: For 5.1-channel sources, Dolby Pro Logic IIz height extensions operate only on the Ls and Rs channels; L, C, R, and LFE channels are bypassed.
Because new formats (such as Blu-ray Disc) allow content to contain up to 7.1 discrete channels from Dolby Digital Plus and Dolby TrueHD audio programs, the height extensions support 7.1 Back sources and offer the following upmixed output configurations:
Note: For 7.1-channel sources, Dolby Pro Logic IIz height extensions may operate only on the Ls, Rs, Lrs, and Rrs channels; L, C, R, and LFE are bypassed.
Log in to the Dolby Customer portal for help with your customer or partner account.
Apply for a license to include Dolby technologies in your products.
More Like This
Sound Bars with Dolby Technologies
Dolby technologies enhance a sound bar's audio capabilities.
A/V Receivers with Dolby
Change the way you experience entertainment at home.
Transform your living room into a sophisticated home theater with surround sound and true-to-life video.
Who We Are