Model 760-03/77 User Guide
Issue 4, October 2016
Studio Technologies, Inc.
Page 21
for Surround
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 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, all the monitor outputs (digital
and analog) will mute. Press and hold
the reference level button; its associ-
ated LED will begin to flash. After five
seconds the LED will light steadily to
indicate that a “snapshot” of the new ref-
erence 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 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 seconds.
The new reference level is now stored in
the Model 760-03’s nonvolatile memory.
Only by repeating the entire procedure
can the value be changed.
Once the configuration mode has been ex-
ited, the digital and analog 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
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 77’s 4-digit numeric display
can be configured to display the post-fader
digital and analog monitor output levels
in either an attenuation mode or an SPL
mode. In the attenuation mode 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 monitor outputs.
In the SPL mode the display can be con-
figured to allow the output level to be
presented to users in terms of the actual
sound pressure level (SPL). It is used in
conjunction with the reference level in dB
SPL configuration and the stored reference
level. The SPL mode allows a user to see
a visual representation of the SPL level
that is present in the listening environment.
While it takes a little more care to correctly
implement the SPL display mode, it can
offer an enhanced experience for Studio-
Comm users.
