Studio Technologies 76D 2014 - Manual (Page 19)

Model 76D/77 User Guide Issue 11, May 2014
Studio Technologies, Inc. Page 19
for Surround
been selected for, as an example, soloing
then the bass management filters will send
any applicable low-frequency content to
the post-fader subwoofer output. So in this
case the solo function is really an “input
channel” solo since the actual acoustical
energy associated with that channel will be
reproduced by both the main channel and
the subwoofer loudspeakers. So while one
is “soloing” a channel (or set of channels)
two or more loudspeakers may be repro-
ducing the signals.
The mute/solos bass management mode
can also be set for post-bass manage-
ment. When this mode is enabled a chan-
nel selected for soloing will cause only its
associated post-fader monitor output chan-
nel to remain active. So if, for example,
one of the main surround input channels
(one of the “5.” channels) is selected for
soloing then all post-fader output chan-
nels except that one will mute. The bass
management filters will remain enabled,
thus sending only the high-passed audio
energy from the soloed input channel to
the soloed output channel. Only if the LFE
channel has been selected for soloing will
the subwoofer output remain active. Typi-
cally the only reason why the post-bass
management mode would be selected is
when troubleshooting issues with the loud-
speaker system.
Sync Source
The Model 76D requires that the desig-
nated external timing reference (sync) be
defined. Three of the choices—word clock,
DARS, and video—are associated with a
signal that is connected to the sync input
BNC connector. The fourth choice allows
the L/R input of the currently selected sur-
round or stereo digital audio input to serve
as the system’s sync source.
Sync Input Termination
The sync input circuitry can be configured
to terminate the signal connected to the
back-panel sync input BNC connector.
When termination is selected a 75 ohm
load is applied to the signal. When the
sync input is not terminated the input im-
pedance is very high, essentially applying
no load to the source. If the sync source
is connected only to the Model 76D then
enabling termination is typically appropri-
ate. However, if the sync source is being
“shared” by multiple inputs then care must
be taken so that the signal is only termi-
nated by one device.
Audio-Synced-to-Video
Sample Rate
If a video sync signal is being used as the
Model 76D’s timing reference the sample
rate of the connected digital audio sig-
nals must be specified. In most cases the
default value of 48 kHz will be appropriate,
but rates from 32 to 192 kHz are available.
Pre-Fader Surround/Stereo
Input C Direct Monitor Output
Type
To meet the needs of specific installations
the nominal impedance and level char-
acteristic of the pre-fader surround and
stereo input C direct monitor outputs can
be selected. They are selected as a group;
configuration of individual outputs is not
provided. If the output signals are going
to be connected to balanced AES3 inputs
then the setting that provides a source
impedance of 110 ohms and a nominal
5 Vpp output level would be appropriate.
If the output signals are going to be con-
nected to unbalanced AES3 inputs then