User Guide

Model 780-01/790 User Guide Issue 4, December 2020
Studio Technologies, Inc. Page 21
for Surround
when the To Stereo downmix function is
active, LFE is reduced in level by 6 dB and
routed to both the left (L) and right (R) post-
fader monitor outputs. When in this mode
and the To Mono downmix function is active
the level of the LFE channel is reduced by
6 dB and routed to the center (C) post-fader
monitor output.
Pre-Fader Monitor Output
Mode
The pre-fader monitor output can be con-
figured as to its place in the Model 780-01’s
signal flow. The choices are pre- or post-
downmix. In the pre-downmix mode the
monitor output channels will not be impacted
by the state of the three downmix functions.
This setting would be appropriate if the pre-
fader monitor outputs were being routed to
a storage system, routed to another facility,
etc. In this case the action of a user enabling
or disabling the downmix functions won’t
impact the level of the pre-fader monitor
output channels. If the post-downmix mode
is selected the pre-fader monitor outputs
will reflect the actions of the downmix func-
tions. This choice would be correct if, for
example, level meters were connected to
the pre-fader monitor outputs. In this scenar-
io a user would want to visually observe
the actions that the downmix functions
impart on the signals. By default the pre-
fader monitor outputs are configured to be
pre-downmix.
Input Delay
A time delay can be added to the input sig-
nals, allowing compensation for delays that
may be present on associated video signals.
The time delay applies to all input sources
and associated channels and cannot be
applied selectively. A configured delay time
is referenced to a sample rate of 48 kHz.
In the case of input signals with a sample
rate of 48 kHz the delay range is 0 to 340
milliseconds in 1-millisecond steps. For
other sample rates the time must be linearly
scaled. For example, for a sample rate of
96 kHz the actual time range is 0 to 170
milliseconds. In this case selecting a delay
of 120 on the Model 790 will result in an
actual time delay of 60 milliseconds.
For operating flexibility two different input
delay values can be selected and stored
during the configuration process. These
can then be enabled as required by the
user during normal system operation. The
default value for both delay A and delay B
is 0 milliseconds. Typical applications would
require only one input delay to be config-
ured. But in other cases two different, both
non-zero, input delay values can be se-
lected. This could be appropriate in applica-
tions where multiple video display systems
are being used in the same control room
or monitoring facility. Each video display
may exhibit its own processing latency and
audio would need to be “lined up” accord-
ingly. During normal StudioComm opera-
tion a user can select the appropriate input
delay for the display system currently being
utilized.
Post-Fader Monitor Output
Level Offsets
To provide assistance during room cali-
bration, the relative output levels of the
post-fader monitor output channels can
be adjusted over a limited range. The
eight channels can be adjusted in 0.5-dB
steps over a ±12-dB range. The default,
of course, is 0 dB for all channels. During
configuration the displayed value repre-
sents the dB level difference as compared
to the nominal output level. In most cases