Studio Technologies 76D V.2.02 - Manual (Page 33)

Model 76D/77 User Guide Issue 2, June 2009
Studio Technologies, Inc. Page 33
for Surround
stereo monitor outputs. And, depending
on the selected configuration, they may
also impact the pre-fader surround monitor
output. Please refer to the Specifications
section of this guide for a detailed descrip-
tion on how the downmix functions perform
their tasks.
A specific downmix function can only be
enabled when it is applicable for the cur-
rently selected input source. This means
that the 5.1 to stereo downmix function
can only be enabled when surround input
A or B is selected.
The Model 77 associates the state of the
downmix functions with the currently se-
lected input. For example, if surround input
A is the selected input source and the 5.1
to stereo downmix function is enabled,
this condition will be “remembered” when
switching to one of the stereo input sourc-
es. Upon returning to surround input A, the
5.1 to stereo downmix function will again
become active.
5.1 to Surround
When the 5.1 to stereo downmix function
is enabled the LS, RS, and C channels
associated with a surround signal are
combined (“folded down”) with the L and
R signals to create a 2-channel stereo (left
and right) signal. And, depending on the
system’s configuration, the LFE channel
may also be combined with the L and R
signals. The resulting stereo signal, some-
times known as LoRo, is routed to the L
and R surround monitor output channels.
The C, LFE, LS, and RS monitor out-
put channels are muted. By utilizing this
downmix function phase relationships and
inter-channel level issues can be quickly
observed.
Stereo to Mono
The stereo to mono downmix function
combines the L and R audio channels to
create a single-channel monaural signal.
This signal is sent out the C surround
monitor output channel while the L, R,
LS, RS, and LFE monitor output channels
are muted.
When a surround source has been se-
lected for monitoring, the 5.1 to stereo
downmix function will automatically enable
whenever the stereo to mono downmix
function is enabled. This ensures that an
operator will hear a mono signal created
by folding down all channels associated
with the selected surround input.
Monitor Output General
Functions
Four buttons and one rotary control are
associated with the post-fader surround
and stereo monitor output functions. The
buttons control operation of the surround
and stereo outputs, reference level, mute
all, and dim functions. The rotary level
control 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
stereo input C direct monitor outputs.
Surround and Stereo Outputs
The surround/stereo function allows se-
lection between two different loudspeaker
systems. When the surround output is
selected the six post-fader surround moni-
tor output channels are active. The two
channels associated with the post-fader
stereo monitor output are muted. When the
stereo output is selected the left and right
channels associated with the post-fader
stereo monitor output become active; the