Studio Technologies 76DBA V.3.00 - Manual (Page 22)

Issue 1, November 2010 Model 76DBA/77B User Guide
Page 22 Studio Technologies, Inc.
for Surround
AES3id inputs then the setting that pro-
vides a 75 ohm source impedance and
a nominal output level of 1 Vpp would be
correct.
Post-Fader Surround/
Auxiliary Stereo Digital
Monitor Output Type
The source impedance and output level
of the post-fader surround and auxiliary
stereo digital monitor outputs, as a group,
can be configured. The information previ-
ously provided concerning configuring the
pre-fader surround/stereo input C direct
digital monitor output type also applies to
these outputs.
Input Select Buttons
The three input select buttons, along with
the group select button, allow six source
configurations to be selected for monitor-
ing. The Model 76DBA has connections
for two surround (5.1) and three stereo
AES3id digital audio sources. Any of these
sources can be assigned to any of the in-
put select buttons. To fit broadcast applica-
tions where it’s typical for non-stereo pairs
to share an AES3id 2-channel path, the
individual left and right audio channels of
stereo inputs A and B can be assigned to
separate input select buttons as required.
These “mono” signals will be routed to the
center pre- and post-fader surround moni-
tor output channels.
Spending time reviewing the input select
button configuration function may prove
very worthwhile. It is a unique feature of
this StudioComm for Surround system and
offers a great opportunity to optimize moni-
toring performance.
Reference Level
For audio-with-picture applications it’s
often beneficial for monitoring to be done
in reference to a known loudspeaker level.
This is often referred to as “mixing to 85
dB” on the monitors. The StudioComm for
Surround system allows a precise post-
fader surround digital and analog monitor
output level to be stored, and then enabled
by pressing the Model 77B button labeled
Reference Level. Setting the reference
level is very simple but care is required:
1. Set up a precision sound pressure
level (SPL) measuring device at the
desired listening location.
2. Place the StudioComm system in the
normal operating mode, not the con-
figuration mode. Be certain that the
dim, mute all, reference level, dialnorm
enable, and downmix functions are not
active. The remote mute all and remote
dim functions must also not be active.
3. Use the Model 77B Control Console to
select the input source that contains
the desired reference signal source,
e.g., pink noise.
4. Observing the SPL meter, adjust the
Model 77B’s rotary level control until
the desired loudspeaker system refer-
ence level has been reached.
5. Being careful not to disturb the posi-
tion of the rotary level control, enter the
configuration mode by pressing and
holding the configuration button locat-
ed on the Model 77B’s back panel.
6. Once the configuration mode has been
entered, all the monitor outputs (digital
and analog) will mute. Press and hold
the reference level button; its associ-
ated LED will begin to flash. After five