Studio Technologies 76DA V.4.12 - Manual (Page 21)

Model 76DA/77 User Guide Issue 9, May 2014
Studio Technologies, Inc. Page 21
for Surround
appropriate. If the digital output signals are
going to be connected to unbalanced AES3
inputs then the setting that provides a 75
ohm source impedance and a nominal out-
put 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 refer-
ence to a known loudspeaker level. This
is often referred to as “mixing to 85 dB” on
the monitors. The StudioComm for Sur-
round 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 Ref-
erence 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, 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 configura-
tion mode must be exited. This is per-
formed by again pressing and holding
the configuration 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