ROTEL RSP985 - Handbuch (Seite 19)

19
Dolby Digital Setup Menu
This menu, which is reached from the MAIN
MENU, provides status information and setup
options for digital inputs.
The first two lines of the screen allow you to
set system-wide configuration options for Dolby
processing:
COMPRESSION: Today’s digital sources are
capable of extremely high dynamic range (the
difference between the softest and loudest
sounds). In some cases, the available dynamic
range may tax the amplifiers or speakers. In
other cases, it may be desirable to compress
the dynamic range when listening at low vol-
ume levels. This configuration option allows
you to select three different levels of dynamic
range: OFF (no compression), MODERATE,
or LATE NIGHT (maximum compression). The
factory default is OFF (no compression). If loud
passages are causing distortion or audible
stress to the system, try a setting with more
compression.
PRO LOGIC: This setting determines how the
RSP-985 processes 2-channel Dolby Digital or
DTS source material. Processing of discrete
multi-channel surround material is automatic.
But, some source material, such as a CD played
on a Dolby Digital DVD or an older movie
soundtrack, might have either a 2-channel
stereo signal or a matrix encoded two-chan-
nel Pro Logic signal. In some cases, the RSP-985
can detect an encoded ID tag which tells it
how to process a 2-channel signal. In other
cases, it cannot.
The options for processing 2-channel signals
from a Dolby Digital or DTS source are as
follows.
Auto/On: Turns on Dolby Pro Logic decod-
ing for all signals unless the RSP-985 is able
to sense a control code identifying the 2-channel
material as conventional stereo, in which case
Pro Logic is turned off automatically. This is
the default setting, suitable for most applica-
tions.
Auto/Off: Turns off Dolby Pro Logic decoding
and plays 2-channel stereo, unless a Pro Logic
signal is specifically identified, in which case
Pro Logic will be activated.
On: Turns on Dolby Pro Logic decoding for
all 2-channel signals, disabling the automatic
sensing.
Off: Turns off Dolby Pro Logic decoding for
all 2-channel signals, disabling the automatic
sensing. Plays conventional 2-channel stereo.
NOTE : The above settings only effect 2-chan-
nel signals from a Dolby Digital or DTS source.
Discrete digital surround signals (e.g. 5.1
channel signals) will play correctly regard-
less of the setting.
The three lines in the DIGITAL AUDIO STATUS
portion of the menu screen provide informa-
tion about the current status of Dolby Digital
inputs:
INPUT: Shows the name of the input source.
SIGNAL: Shows the format of the current
source, i.e. DOLBY DIGITAL, DTS, etc.
CHANNELS: Dolby Digital and DTS signals
can contain up to six discrete channels of in-
formation – left, center, right, left rear, right
rear, and a subwoofer or low frequency ef-
fects channel. This status line indicates how
many channels are active in the current source
material.
Input Setup Menu
The RSP-985 accepts both analog and digi-
tal signals. The INPUT SETUP menu allows you
to configure each input:
INPUT: Select the input you wish to setup by
highlighting this line and stepping through the
available choices with the VOLUME DOWN/
UP buttons. You will need to configure each
input, repeating the following configuration
sequence several times, each time selecting
a different input.
INPUT DOMAIN: Select ANALOG or DIGI-
TAL or AUTO depending on the type of sig-
nal connection you have made by stepping
through the available choices with the VOL-
UME DOWN/UP buttons. Using a DIGITAL
signal, if available, avoids a D/A conversion
in the source component and A/D conversion
in the RSP-985. Note that even when using a
digital input, you still should make analog con-
nections from the source. These will be used
for recording, regardless of the setting on this
menu. Selecting AUTO for the input will check
for the presence of a DIGITAL signal and au-
tomatically revert to an ANALOG input if no
DIGITAL signal is present.
VOLUME OFFSET: This menu item adjusts
the volume of each source component so that
the volume level remains relatively constant
when switching between sources and so that
the signal does not overload the RSP-985. Typi-
cally, you determine which source has the low-
est level and then match the others to that one.
Adjust the level using the VOLUME DOWN/
UP buttons. Note that you are matching the
perceived level you hear from that source, not
the dB readout that appears on-screen.
NOTE
: It is essential not to set the source input
levels so high that the signal overloads the
RSP-985’s input circuitry. Adjust to match the
quietest source, not the loudest.
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