User Guide

Model 780-01/790 User Guide Issue 4, December 2020
Studio Technologies, Inc. Page 19
for Surround
level to be stored and then enabled by
pressing the Model 790 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. Ensure that the StudioComm system
is in its normal operating mode, not the
configuration mode. Be certain that the
dim, mute all, reference level, down-
mix, input mute/solo, and output mute
functions 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 refer-
ence 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 for two
seconds. Once the configuration mode
has been entered the pre- and post-
fader monitor outputs will mute.
6. 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 “snap-
shot” 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 negative number as
it’s always a value less than the maxi-
mum output level. The reference level
button can now be released.
7. To complete the process the con-
figuration mode must be exited. This
is performed by again pressing and
holding the configuration button for
two seconds. The new reference level
is now stored in the Model 780-01’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
recognized. 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
monitor output level in either an attenua-
tion mode or an SPL mode. In the attenua-
tion 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