Studio Technologies 76DA V.4.00 - Manual (Page 21)

Model 76DA/77 User Guide Issue 3, July 2012
Studio Technologies, Inc. Page 21
for Surround
and a nominal 5 Vpp output level would
be appropriate. If the digital output signals
are going to be connected to unbalanced
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/Stereo
Digital Monitor Output Type
The source impedance and output level of
the post-fader surround and stereo digital
monitor outputs, as a group, can be config-
ured. The information previously provided
concerning configuring the pre-fader sur-
round/stereo input C direct digital monitor
output type also applies to these outputs.
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 77 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 config-
uration mode. Be certain that the dim,
mute all, reference level, and downmix
functions are not active. The remote
mute all and remote dim functions
must also not be active.
3. Use the Model 77 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 77’s rotary level control until the
desired loudspeaker system reference
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 77’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
seconds the LED will light steadily to
indicate that a “snapshot” of the new
reference level has been taken. The
Model 77’s numeric 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 reference level button can now be
released.
7. To complete the process the configu-
ration mode must be exited. This is
performed by again pressing and hold-
ing the configure button for two sec-
onds. The new reference level is now
stored in the Model 76DA’s nonvolatile
memory. Only by repeating the entire
procedure can the value be changed.
Once the configuration mode has been
exited, the digital and analog monitor out-
puts will again become active. Confirm
that the correct level has been stored by
pressing the reference level button. The