User Guide

Model 780-01/790 User Guide Issue 4, December 2020
Studio Technologies, Inc. Page 39
for Surround
The output mute function organizes the
monitor output channels into two groups:
the main channels (mains) and the sub-
woofer (SUB). The mains group consists
of the seven main output channels: left (L),
right (R), center (C), surround left (SL),
surround right (SR), back left (BL), and
back right (BR). The SUB group consists
of only the subwoofer (SUB) output chan-
nel. Two buttons and associated LEDs are
used to control the output mute function.
Both buttons function in a push-on/push-off
manner.
It may be confusing at first to imagine why
the output mute buttons are important. The
reason, like the input mute/solo function,
is bass management. The input mute/solo
function allows observation of the channels
associated with the surround and stereo
inputs. But soloing a single channel, such
as the left input of surround A, may result
in audio content coming out of the system
and being reproduced by both the left (L)
and subwoofer (SUB) loudspeakers. By
maintaining the left channel in the input
solo mode, a user can activate the output
mute function to independently mute the
left (L) and subwoofer (SUB) output chan-
nels as desired.
Input Delay
Two input delay settings, A and B, can be
selected and saved during system con-
figuration. These are provided for align-
ing the audio input signals with latencies
(delays) associated with video processing
and display systems. During normal opera-
tion a user can select to have either input
delay A or input delay B active. The input
mute/solo mode button, the output mute
SUB button, and the 4-digit display are
used to select and display the input delay.
When the mute/solo button is pressed and
held the LED associated with the output
mute SUB button indicates whether input
delay A or input delay B is active. The LED
will be lit when input delay B is active.The
4-digit display will show the active delay
time in milliseconds referenced to a 48 kHz
sample rate. The delay time will “scale”
depending on the actual sample rate at
which the Model 780-01 is operating.
While pressing and holding the mute/solo
button the output mute SUB button can
be pressed to change the selected input
delay. Refer to Figure 10 for details. The
selected input delay will be stored in non-
volatile memory such that a power-down/
power-up cycle will not change the active
selection.
Display and Display Mode
The Model 790’s 4-digit LED display
shows the post-fader monitor output level
as either the amount of attenuation or the
sound pressure level (SPL). Both will in-
dicate level in dB. What the digits actually
represent will depend upon how the Model
790 has been configured.
Display in dB of Attenuation
If configured for the attenuation mode the
display will show the monitor output level
as an attenuation value in reference to the
maximum output. This is in the form of 0.5-
dB steps less than the maximum of 0.0 dB.
So a display of –40.5 would indicate that
the post-fader monitor output is set to be
40.5 dB below the maximum level. As the
rotary level control is moved counterclock-
wise the output level will go down and the
indicated value will get more negative.
Display in dB SPL
If the Model 790 is configured to display
the monitor output level in dB SPL, the