Studio Technologies 761 - Manual (Page 17)

Model 761/771 User Guide Issue 1, March 2008
Studio Technologies, Inc. Page 17
for Surround
For PAL broadcast applications a setting
of –18 dBFS for the digital input and 0 dBu
for the analog outputs would be typical.
SD Primary Input Type
The type of source connected to the digital
audio input connectors associated with the
SD primary input selection can be con-
fi gured. The choices are 5.1 surround or
2-channel stereo. When selected for 5.1
surround six input channels are associated
with SD primary: L, R, C, LFE, LS, and
RS. Selecting 5.1 surround as the input
type also allows the 5.1 to stereo downmix
function to be enabled. When the input
type is selected for 2-channel stereo only
the L and R channels are active for SD
primary; C, LFE, LS, and RS are disabled.
In addition, the 5.1 to stereo downmix
function is disabled.
Director Cue Output Nominal Level
The nominal level of the director cue out-
put can be confi gured from four available
settings: +4.0 dBu, 0.0 dBu, –6 dBu, and
–12.0 dBu. This range of settings is pro-
vided so that compatibility can be achieved
with a variety of connected devices. The
+4.0 dBu and 0.0 dBu settings are ap-
propriate for device inputs that expect to
receive full line-level signals. Devices such
as amplifi ed speakers will often perform
better when receiving signals with a lower
nominal level. In the latter case the ability
to comfortably use a level potentiometer
may be greatly enhanced using the –6.0
dBu or, especially, the –12.0 dBu setting.
Reference Level
For audio-with-picture applications it’s
often benefi cial 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
system allows a precise monitor output
level to be stored, and then enabled by
pressing the Model 771 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 confi g-
uration mode. Be certain that the dim,
mute all, reference, dialnorm enable,
and downmix functions are not active.
The remote mute or remote dim func-
tions must also not be active.
3. Use the Model 771 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 771’s rotary level control until
the desired reference monitor system
level has been reached.
5. Being careful not to disturb the position
of the rotary level control, enter
the confi guration mode by pressing
and holding the confi guration button
located on the Model 771’s back panel.
6. Once the confi guration mode has been
entered, the monitor outputs will mute.
Press and hold the reference button;
the associated LED will begin to fl ash.
After fi ve seconds the LED will light
solidly to indicate that a “snapshot” of
the new reference level has been tak-
en. The level display will then show the
value of the new reference level. The
value shown will always be a negative
number as it’s always a value less than
the maximum output level. The refer-
ence button can now be released.