Studio Technologies 76D V.2.02 - Manual (Page 11)

Model 76D/77 User Guide Issue 2, June 2009
Studio Technologies, Inc. Page 11
for Surround
to the + and – terminals and still experi-
ence correct operation. This would leave the
shield connection unterminated.
Refer to Figure 4 or Appendix A for the
exact connection details. Note that unlike
a DA-88-style assembly, the two threaded
fasteners associated with the Model 76D’s
D-sub connector use 4-40 threads. This
complies with the original design standard
for D-sub connectors.
Pre-Fader Surround Monitor Output
The pre-fader surround monitor output
channels are intended to connect to me-
tering, measurement, test, or other signal
monitoring equipment that require uninter-
rupted, full-level digital audio signal sources.
Post-Fader Surround Monitor Output
The post-fader surround monitor output
channels are designed for connection to
audio amplifiers associated with monitor
loudspeakers or to the inputs of loudspeak-
ers that contain integrated amplifiers.
Post-Fader Stereo Monitor Output
The post-fader stereo monitor output
channels are intended to support a stereo
loudspeaker system, either connecting to
an amplifier associated with a set of loud-
speakers or directly to a set of amplified
speakers.
Stereo Input C Direct Monitor Output
The stereo input C direct monitor output
is intended for use in site-specific applica-
tions. It provides an uninterrupted, full-level
digital audio signal source.
Sync Input
An external timing reference signal must
be connected to the Model 76D. This syn-
chronization (“sync”) signal must maintain
a stable relationship between itself and the
connected digital audio signals. The ac-
tual sync source can be in one of several
forms: word clock, DARS, AES3id, bi-level
video, or tri-level video. The source of the
Model 76D’s sync reference will, in most
cases, be a dedicated sync signal con-
nected to the unit’s sync input. Alternately,
the AES3id-compatible digital audio source
connected to the L/R input of surround A
can also serve as the sync reference. A
configuration choice, described later in
this user guide, is used to select the actual
sync source to be utilized. In this section
of the user guide details will be provided
regarding connection of a dedicated sync
signal to the sync input. This is the recom-
mended method and in most cases should
be utilized.
An overview of the various compatible
timing reference signals might prove
worthwhile. Word clock is a digital signal
that is locked in phase and frequency to
the sample rate of the associated digital
TASCAM® Signal Signal
Connections Channel High (+) Low (–) Shield
Pre-Fader L/R 1 24 12 25
Pre-Fader C/LFE 2 10 23 11
Pre-Fader LS/RS 3 21 9 22
Stereo Input C Direct 4 7 20 8
Post-Fader L/R 5 18 6 19
Post-Fader C/LFE 6 4 17 5
Post-Fader LS/RS 7 15 3 16
Post-Fader Stereo 8 1 14 2
Notes: 1) All signals transformer-coupled digital audio;
selectable for AES3 or AES3id compatibility.
2) Connector type on Model 76D is 25-pin
D-subminiature female (DB-25F). Installer must
provide male (DB-25M). Connector uses 4-40
threaded inserts for locking with mating plug.
3) Wiring scheme follows TASCAM DA-88 convention.
Standard DA-88-type wiring harnesses are directly
compatible, with the exception of 4-40 screw threads
being required.
Figure 4. Connections for Monitor Outputs