Studio Technologies 76 V.1.10 - Manual (Page 16)

Issue 7, August 2012 Model 76/77 User Guide
Page 16 Studio Technologies, Inc.
for Surround
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 or remote dim functions must
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 reference monitor system 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 located on the
Model 77’s back panel.
6. Once the configuration mode has been
entered, the monitor outputs will mute.
Press and hold the reference 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 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 configure button for two seconds.
The new reference level is now stored
in the Model 76’s nonvolatile memory.
Only by repeating the entire procedure
can the value be changed.
Once the configuration mode has been ex-
ited, the monitor outputs will again become
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 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 77’s 4-digit numeric display can
be configured 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 counterclock-
wise direction the display will show negative
values, reaching approximately –69.5 dB
before the full mute function automatically
mutes the outputs.
In the SPL mode the display can be config-
ured to allow the output level to be presented
to users in terms of the actual sound pres-
sure level (SPL). Used in conjunction with
the reference level in dB SPL configuration
and the stored reference level, SPL mode