Studio Technologies 76B 2008 - Manual (Page 18)

Issue 1, July 2008 Model 76B/77B User Guide
Page 18 Studio Technologies, Inc.
for Surround
by pressing the Model 77B 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 con-
fi guration mode. Be certain that the
dim, mute all, reference level, dialnorm
enable, and downmix functions are not
active. The remote mute all or remote
dim functions must not be active.
3. Use the Model 77B 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 77B’s rotary level control until
the desired reference monitor system
level has been reached.
5. Being careful not to disturb the posi-
tion of the rotary level control, enter the
confi guration mode by pressing and
holding the confi guration button locat-
ed on the Model 77B’s back panel.
6. Once the confi guration mode has been
entered, the monitor outputs will mute.
Press and hold the reference level
button; its associated LED will begin
to fl ash. After fi ve seconds the LED
will light steadily to indicate that a
“snapshot” of the new reference level
has been taken. The Model 77B’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 confi gura-
tion mode must be exited. This is per-
formed by again pressing and holding
the confi gure button for two seconds.
The new reference level is now stored
in the Model 76B’s nonvolatile memory.
Only by repeating the entire procedure
can the value be changed.
Once the confi guration mode has been
exited, the monitor outputs will again be-
come active. Confi rm 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
fi ve seconds before the selected value is
recognized. This is provided specifi cally so
that unauthorized users won’t accidentally
change the reference level while they ex-
periment with the confi guration mode. Only
if you know the “secret” will you be able to
store a new value.
Overall Display Mode
The Model 77B’s 4-digit numeric display
can be confi gured to display the output
level in either an attenuation mode or an
SPL mode. In the attenuation mode the
output level is shown as a reduction in
value 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 moved in
the counterclockwise direction the display
will show negative values, reaching ap-
proximately –69.5 dB before the full mute
function automatically mutes the outputs.
In the SPL mode the display can be
confi gured to allow the output level to be
presented to users in terms of the actual