Studio Technologies 76DA V.3.01 - Manual (Page 35)

Model 76DA/77 User Guide Issue 2, April 2011
Studio Technologies, Inc. Page 35
for Surround
be converted to mono. Using the downmix
functions simply requires pressing the de-
sired button. The buttons are set to always
“latch” the functions on and off. An LED is
located adjacent to each button and lights
whenever its respective function is active.
The downmix functions always impact the
post-fader surround and stereo digital and
analog monitor outputs. And, depending
on the selected configuration, they may
also impact the pre-fader surround digital
monitor output. Please refer to the Speci-
fications section of this guide if you’d like
a detailed description of 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
selected input. For example, if surround in-
put 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 Stereo
When the 5.1 to stereo downmix function
is enabled the LS, RS, and C channels
associated with a surround source 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 chan-
nel may also be combined with the L and
R signals. The resulting stereo signal,
sometimes known as LoRo, is routed to
the L and R surround digital and analog
monitor output channels. The C, LFE, LS,
and RS digital and analog 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
digital and analog monitor output channels
while the L, R, LS, RS, and LFE digital and
analog monitor output channels are muted.
When a surround source has been
selected 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 digital and analog monitor out-
put functions. The buttons control opera-
tion of the surround and stereo digital and
analog outputs, reference level, mute all,
and dim functions. The rotary level control
is used to manually set the post-fader sur-
round and stereo digital and analog moni-
tor output levels. These buttons and the
rotary control do not impact the pre-fader
surround and stereo input C direct digital
monitor outputs.