Studio Technologies 780-03 V.4.15 - Manual (Page 20)

Issue 1, April 2015 Model 780-03/790 User Guide
Page 20 Studio Technologies, Inc.
for Surround
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. Ensure that the StudioComm system is
in its normal operating mode, not the
configuration mode. Be certain that the
dim, mute all, reference level, downmix,
input mute/solo, and output mute func-
tions are not active. The remote mute all
and remote dim functions must also not
be active.
3. Use the Model 790 Control Console to
select the input source that contains the
desired reference signal source, e.g.,
pink noise. This would typically be one
of the surround inputs rather than the
stereo input.
4. Observing the SPL meter, adjust the
Model 790’s rotary level control until the
desired loudspeaker system reference
level has been reached.
5. Being careful not to disturb the position
of the rotary level control, enter the con-
figuration mode by pressing and holding
the configuration button for two seconds.
Once the configuration mode has been
entered all the monitor output channels
(digital and analog) will mute.
6. Press and hold the reference level but-
ton; 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 790’s numeric display will then
show the value of the new reference level.
The value shown will always be a nega-
tive number as it’s always a value less
than the maximum output level. The refer-
ence 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 780-03’s nonvolatile
memory. Only by repeating the entire
procedure can the value be changed.
Once the configuration mode has been
exited, the monitor digital and analog moni-
tor outputs will again become active. Con-
firm 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 calibration 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 rec-
ognized. This is provided specifically so
that unauthorized users won’t accidentally
change the reference level while they ex-
periment with the configuration mode. Only
if you know the “secret” will you be able to
store a new value.
Overall Display Mode
The Model 790’s 4-digit numeric display
can be configured to display the post-fader
digital and analog monitor output level in ei-
ther an attenuation mode or an SPL mode.
In the attenuation mode (the default), the
output level is shown as a reduction in level,
in dB, relative to the maximum output level.
When the rotary control is used to set the
output level to its maximum the display will
show
0.0. As the rotary control is turned in
the counterclockwise direction the display
will show negative values, reaching –70.0
before the full mute function automatically
mutes the post-fader monitor outputs.