Studio Technologies 780-03 V.4.15 - Manual (Page 40)

Issue 1, April 2015 Model 780-03/790 User Guide
Page 40 Studio Technologies, Inc.
for Surround
muting the post-fader digital and analog
monitor output channels. These serve as
an aid in observing the performance of the
associated loudspeaker system. The output
mute function organizes the monitor output
channels into two groups: the main chan-
nels (mains) and the subwoofer (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 channel. 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 main-
taining 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 channels 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 780-03 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 11 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 digital and analog monitor
output levels as either the amount of atten-
uation or the sound pressure level (SPL).
Both will indicate level in dB. What the dig-
its 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 digital and analog moni-
tor output is set to be 40.5 dB below the
maximum level. As the rotary level control
is moved counterclockwise the output level
will go down and the indicated value will
get more negative.