Yamaha DSP-A1092 Owner's Manual page 38

DESCRIPTIONS OF THE FUNCTIONS
1. CENTER DELAY (Adjusting the delay of center
sounds (dialog etc.))
Control range: 0 ms to 5 ms (in 1 ms step)
Preset value: 0 ms
* This adjustment is effective only when the Dolby Digital (AC-3)
is decoded and the signals of selected source encoded with the
Dolby Digital (AC-3) contain center-channel signals.
Adjusts the delay between the main sounds (at the main
channels) and dialog etc. (at the center channel).
The larger the value, the later the dialog etc. is generated.
This is for making sounds from the left main, center and right
main speakers reach your listening position at the same time by
delaying the sound from the center speaker if the distance from the
center speaker to your listening position is shorter than the
distance from the left or right main speaker to your listening
position.
2. DYNAMIC RANGE (Adjusting dynamic range)
Choices: MAX/STD/MIN
Preset position: MAX
* This adjustment is effective only when the Dolby Digital (AC-3)
is decoded.
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MAX: "Dynamic range" is the difference between the maximum
level and the minimum level of sounds. Sounds on a movie
originally designed for movie theaters feature very wide
dynamic range.
Dolby Digital (AC-3) technology can bring the original
sound track into a home audio format with this wide
dynamic range unchanged.
In this position, a source encoded with the Dolby Digital
(AC-3) is reproduced in the original sound track's wide
dynamic range providing you with powerful sounds like a
movie theater.
Selecting this position will be more ideal if you can listen to
a source in a high output level in a room specially
soundproofed for audio/video enjoyment.
STD (Standard):
Powerful sounds of extremely wide dynamic range are not
always suitable for home use. Depending upon the
condition of your listening environment, it may not possible
to increase the sound output level as high as a movie
theater, however, in a level proper for listening to in your
room, the low level parts of source sound cannot be heard
as well because they will be lost among noises in your
environment.
Dolby Digital (AC-3) technology also makes it possible to
reduce an original sound track's dynamic range for a home
audio format by "compressing" the data.
In this position, a source encoded with the Dolby Digital
(AC-3) is reproduced in the "compressed" dynamic range
of the source suitable for low level listening.
MIN: In this position, dynamic range is more reduced than in the
STD position. Selecting this position will be effective when
you must listen to a source in extremely low level.