User Guide

Issue 13, December 2020 Model 76D/77 User Guide
Page 40 Studio Technologies, Inc.
for Surround
buttons control operation of the surround
and stereo outputs, reference level, mute
all, and dim functions. The rotary level con-
trol is used to manually set the post-fader
surround and stereo monitor output levels.
These buttons and the rotary control do
not impact the pre-fader surround and ste-
reo input C direct monitor outputs.
Surround and Stereo Outputs
The surround/stereo function allows selec-
tion between two different loudspeaker
systems. When the surround output is
selected the six post-fader surround moni-
tor output channels are active. The chan-
nels associated with the post-fader stereo
monitor output are muted. When the stereo
output is selected the left (L) and right (R)
channels associated with the post-fader
stereo monitor output become active; the
six channels of the post-fader surround
monitor outputs mute.
Remember that the Model 77 Control
Console can be configured to disable the
surround/stereo button. If the button is
pressed and the post-fader stereo moni-
tor output is not selected, this must be the
case!
Display Current Sample Rate
The surround/stereo monitor output select
button is also used to display the system’s
current sample rate value. Pressing and
holding the surround/stereo button will
cause the current sample rate value to be
displayed: 32.0, 44.1, 48.0, 88.2, 96.0,
176.4, or 192.0. This can be useful during
troubleshooting or just for general interest.
Once the button is released normal display
operation will resume.
Reference Level
The reference level button sets the post-
fader surround and stereo monitor out-
put levels to a preset value. Technical
personnel, using a sound-pressure-level
(SPL) meter and precision signal source,
should have set this level to meet the
requirements of the specific monitoring
environment. The LED associated with the
reference level button will light whenever
the function is active. The 4-digit display
will indicate the reference output level.
Note that the system’s default reference
level is –60.0 dB so “out of the box” the
Model 77 will display –60.0 when refer-
ence level mode is enabled.
How the rotary level control functions
whenever the reference level mode is
active depends on a configuration set-
ting. If the auto reference level off function
is disabled turning the rotary level con-
trol will have no impact on the reference
level function; it will remain active. If the
auto reference level off function has been
enabled turning the rotary level control will
cause the reference level function to auto-
matically turn off.
The LED associated with the reference
level button can also serve as a calibration
aid. If the reference level mode is not ac-
tive, whenever the post-fader surround or
stereo monitor output levels are precisely
the same as that stored for the reference
value the reference level LED will flash.
This exact level can be reached through
the use of the rotary level control, either
by itself or through the setting of the rotary
level control in conjunction with the dim
function. Whatever path the post-fader
surround and stereo monitor outputs take
to reach the reference level value, it will
cause the reference level LED to flash!