Studio Technologies 780-03 V.4.15 - Manual (Page 12)

Issue 1, April 2015 Model 780-03/790 User Guide
Page 12 Studio Technologies, Inc.
for Surround
Pre-Fader Monitor Output
The pre-fader digital monitor output chan-
nels are intended to connect to metering,
measurement, or other signal monitoring
equipment that requires uninterrupted, full-
level digital audio signal sources.
Post-Fader Monitor Output
The post-fader digital monitor output chan-
nels are designed for connection to digital
inputs on audio amplifiers associated with
monitor loudspeakers. Alternately, they can
be connected to the inputs of loudspeakers
that contain integrated amplifiers with digital
audio input capability.
Analog Monitor Outputs
The 25-pin female D-subminiature connec-
tor on the back panel labeled Analog Moni-
tor Outputs provides access to the Model
780-03’s post-fader analog surround (7.1)
monitor output. The eight output channels
are intended for connection with the inputs
on a loudspeaker system that provides
seven main channels and one subwoofer
channel.
The analog monitor output channels are
designed for connection to audio amplifiers
associated with monitor loudspeakers, or
to the inputs of loudspeakers that contain
integrated amplifiers. The analog monitor
outputs are electronically balanced and
will perform optimally when driving loads
of 2000 (2 k) ohms or greater. In most ap-
plications 3-pin male XLR connectors will
be used to interface with the inputs on the
associated amplifiers or amplified speakers.
In this case the + terminal would go to pin 2
of the XLR, the – terminal to XLR pin 3, and
the shield terminal to XLR pin 1.
Balanced operation of the post-fader ana-
log monitor outputs is the preferred con-
nection method but unbalanced operation
does not pose a problem. To connect to an
unbalanced load connect the + terminal as
signal high, and only the Model 780-03’s
shield terminal as the signal low/shield.
Leave the – terminal unconnected. For cor-
rect unbalanced operation, it is important
not to connect – and shield together.
The wiring scheme used by the D-submin-
iature connector complies with AES59-
2012, as made popular by TASCAM. A
wiring assembly prepared for the Model
780-03’s analog monitor outputs is identi-
cal to that of a TASCAM-type output as-
sembly. Please refer to Figure 6 for the
exact connection details. Again note that
unlike a TASCAM-type assembly, the
Model 780-03’s D-sub connectors use
4-40 threads.
Signal Signal
Connections Channel High (+) Low (–) Shield
Left (L) 1 24 12 25
Right (R) 2 10 23 11
Center (C) 3 21 9 22
Subwoofer (SUB) 4 7 20 8
Surround Left (SL) 5 18 6 19
Surround Right (SR) 6 4 17 5
Back Left (BL) 7 15 3 16
Back Right (BR) 8 1 14 2
Notes: 1) Connector type on Model 780-03 is 25-pin female
D-subminiature (DB-25F). Installer must provide male
(DB-25M). Connector uses 4-40 threaded inserts for
locking with mating plug.
2) Wiring scheme follows AES59-2012 convention.
Standard TASCAM-type wiring harnesses are directly
compatible, with the possible exception of 4-40 screw
threads being required.
Figure 6. Connections for Analog Monitor
Outputs