Here is a Q&A about Pro Logic IIx, prepared by Dolby Labs and reprinted from the Dolby Labs
website, with permission.
1. What is Dolby
®
Pro Logic
®
IIx?
Dolby Pro Logic IIx is an extension of Dolby Pro Logic II technology. This highly sophisticated algo-
rithm processes native stereo- and 5.1 channel material to produce 6.1 or 7.1 output channels.
Dolby Pro Logic IIx expands choice in playback system configuration (allowing 5.1, 6.1, or 7.1
playback channels) and, when incorporated into an audio/video (AV) receiver or processor, allows
a convenient upgrade path from a traditional 5.1 channel sound system to 7.1 output channels.
2. Does Dolby Pro Logic IIx replace Dolby Pro Logic II?
No. Dolby Pro Logic IIx uses the same core technology as Dolby Pro Logic II, but extends its
functionality. Dolby Pro Logic II technology will continue as the primary surround decoder for
two to 5.1 channel material. Pro Logic IIx will be integrated by manufacturers into hardware
components that offer 6.1 or 7.1 output capability.
3. Why does Dolby Pro Logic IIx sound more natural than competing formats?
For a few reasons. One is the newly developed approach in steering logic design, which pro-
vides unprecedented smoothness and precise dynamics. Another is the lack of signal coloration
achieved by employing the simplest audio path, with as little filtering of the audio as possible.
4. What were the sonic goals in developing Dolby Pro Logic IIx?
•
Improved surround envelopment
•
Enhanced sense of spatial depth
•
Improved directionality
•
Larger listening area, commonly referred to as the “sweet spot”
•
Compatibility of all native stereo and 5.1 channel content with 6.1 and 7.1 playback configurations
5. What are the key differences between Dolby Pro Logic IIx and other existing 6.1 channel
and 7.1 channel offerings?
•
Dolby Pro Logic IIx is the only technology package that covers both 6.1 and 7.1 speaker
configurations.
•
Dolby Pro Logic IIx maintains the sonic clarity of Dolby Pro Logic II across all sources and
output modes, ensuring unmatched aesthetic consistency and purity.
•
Dolby Pro Logic IIx introduces no artificial coloration during playback. It remains true to the
artist’s intent.
6. Are the Surround and Back channels full range?
Yes, with a 20 Hz to 20 kHz frequency response.
7. Will manufacturers offer Dolby Pro Logic IIx in a 7.1 satellite/sub configuration?
Yes. With proper bass management executed within the surround controller, a 7.1 satellite /
subwoofer configuration — where all low frequencies are routed to the subwoofer —
is indeed possible.
TECHNICALLY SPEAKING
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