Studio Technologies 591 - Manual (Page 19)

Issue 1, September 1999 Model 58/591 User Guide
Page 22 Studio Technologies, Inc.
monitor output B to become active when
the bypass mode is active. Also, when the
bypass mode is configured to follow the
A/B button, the monitor output mode must
be configured to allow A/B operation or
only monitor output A will be enabled
during bypass operation. The factory
default is for the bypass function to follow
the state of the monitor output A/B select
button.
Reference Level
For audio-with-picture applications it’s
critical that mixing be done in reference
to a known monitor loudspeaker level. This
is often referred to as mixing to “85dB” on
the monitors. The Model 591 Control
Console allows a precise monitor output
level to be stored, and then enabled by
pressing the button labeled REF. The
factory default is for the reference level to
be set for full attenuation. Setting a usable
reference level is very simple:
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
reference, mute all, dim, and insert
functions are not active.
3. Use the Model 591 Control Console
to select the reference signal source,
e.g., pink noise, to the left and right
monitor outputs.
4. Observing the SPL meter, adjust the
Model 591’s rotary level control until
the desired reference level has been
reached.
5. Being careful not to touch the position
of the rotary level control, enter the
configuration mode by pressing and
holding the configure button, located
on the Model 591’s back panel.
6. Once the configuration mode has been
entered, the monitor output signal will
mute. Press and hold the reference
button until its associated LED lights.
This will take 5 seconds. The LED
lights to indicate that a “snapshot”
of the new reference level has been
taken.
7. To store the new reference level in
memory, exit the configuration mode
by again pressing and holding the
configure button.
This level is now permanently stored as
the reference level. Only by repeating the
procedure can the value be changed.
Once the configuration mode has been
exited, the monitor output will again be-
come active. Confirm that the correct level
has been stored by pressing the reference
button. The SPL meter should again
display the desired level. If not, repeat the
calibration process.
You might wonder why you have to press
and hold the reference button for 5 sec-
onds before the value is stored. This is
provided specifically so that some Bozo
won’t accidentally change the ref level
while they are playing around in the con-
figuration mode! You have to know the
“secret” to be able to store a new value.
Input Source Presets
The input source presets can be individu-
ally configured to match commonly used
monitoring scenarios. Any, or all, of the
input routing buttons can be selected for
each of the input source presets. As an
example, the factory default for input