Studio Technologies 76D 2014 - Manual (Page 20)

Issue 11, May 2014 Model 76D/77 User Guide
Page 20 Studio Technologies, Inc.
for Surround
the setting that provides a 75 ohm source
impedance and a nominal output level of
1 Vpp would be correct.
Post-Fader Surround/Stereo
Monitor Output Type
The source impedance and output level of
the post-fader surround and stereo moni-
tor outputs, as a group, can be configured.
The information previously provided con-
cerning configuring the pre-fader surround/
stereo input C direct 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 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 will
mute. Press and hold the reference
level button; its associated 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 nu-
meric display will then show the value
of the new reference level. The value
shown will always be a negative num-
ber 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 76D’s nonvolatile
memory. Only by repeating the entire
procedure can the value be changed.
Once the configuration mode has been
exited, the monitor outputs will again be-
come active. Confirm that the correct level
has been stored by pressing the reference
level button. The SPL meter should display
the desired level. If not, repeat the calibra-
tion procedure to achieve the desired goal.
You might wonder why you have to press
and hold the reference level button for
five seconds before the selected value is