8. Will Dolby Pro Logic IIx process DTS 5.1 content, and is it compatible with DTS-ES discrete and
matrix-encoded software?
Processing of DTS content is an available option. While Dolby Pro Logic IIx technology is fully
compatible with DTS and DTS-ES, whether a product supports them is, of course, dependent
upon DSP capability and hardware design.
9. Does Dolby Pro Logic IIx introduce any sound delay?
There is some surround delay in certain modes, as in all other Dolby Pro Logic decoder systems.
Otherwise, no.
10. Is any front-channel information being mixed into the Rear speakers by Dolby Pro Logic IIx?
No.
11. What happens in signal processing behind the Center Width control?
When a logic decoder “steers” the Center signal, it is, in essence, removing Center channel sig-
nals from the Left and Right outputs. The Center Width control allows the amount of steering that
is applied to Center signals to be modified. It reduces the “hard Center channel” that sometimes
results from Center steering of stereo encoded soundtracks.
12. Is the Panorama mode more, or less, useful in a 7.1 environment?
The function of the Panorama mode is to create a more enveloping front surround field. It is
equally useful when applied to Dolby Pro Logic IIx processing.
13. What are the differences between Music mode and Movie mode?
Surround programs are primarily mixed like movies. When shows are mixed in surround, they are
monitored through the surround decoder that will be used for playback in the cinema or home.
Movie mode is the reference decoder mode for any such surround-encoded program.
Music mode brings the benefits of a highly natural and balanced multichannel surround soundfield
to content that was not specifically encoded for surround playback.
14. Is there a height element to Dolby Pro Logic IIx?
No, because content is not being made with specifically encoded height information. Without
encoded content, any effect created, however pleasurable, would be mere speculation.
15. What is the effect of the Surround and Back speakers?
The Surround and Back speakers enable a more enveloping, more involving, and more precise
listening experience.
16. Are the Surrounds and Backs stereo channels?
Yes, but they are not discrete. The Surround and Back channels are each derived from Dolby Pro
Logic IIx logic decoding, so the separation varies in response to the input signal.
17. Does Dolby have a preference for Rear and Back Surround speaker configurations?
Not necessarily, since different rooms often benefit from different solutions. However, direct
radiators often provide maximum clarity and detail and, therefore are often recommended.
18. Will you develop Dolby Pro Logic IIx matrix encoders for the entertainment industry?
Possibly. But it is worth noting that unlike Dolby Pro Logic II, which requires its own encoders to
achieve maximum benefit, Dolby Pro Logic IIx can be fully exploited using today’s encoding tools
and mixing consoles.
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