Studio Technologies 74 - Manual (Page 10)

Model 74/75 User Guide Issue 2, January 2006
Studio Technologies, Inc. Page 11
for Surround
Signal Signal
Connections High (+) Low (–) Shield
SURROUND A-L 24 12 25
SURROUND A-R 10 23 11
SURROUND A-C 21 9 22
SURROUND A-LFE 7 20 8
SURROUND A-LS 18 6 19
SURROUND A-RS 4 17 5
STEREO A-L 15 3 16
STEREO A-R 1 14 2
Notes: 1) Connector type on Model 74 is 25-pin D-subminiature
female. Installer must provide plug (male). Connector
uses 4-40 threaded inserts for locking with mating plug.
2) 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 6. Connections for Inputs Surround A
and Stereo A
Signal Signal
Connections High (+) Low (–) Shield
SURROUND B-L 24 12 25
SURROUND B-R 10 23 11
SURROUND B-C 21 9 22
SURROUND B-LFE 7 20 8
SURROUND B-LS 18 6 19
SURROUND B-RS 4 17 5
STEREO B-L 15 3 16
STEREO B-R 1 14 2
Notes: 1) Connector type on Model 74 is 25-pin D-subminiature
female. Installer must provide plug (male). Connector
uses 4-40 threaded inserts for locking with mating plug.
2) 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 7. Connections for Inputs Surround B
and Stereo B
Balanced sources should be wired so that
signal high is connected to +, signal low to
–, and shield to the shield connection. With
an unbalanced source, connect signal high
to the + connection, and shield to both the
– and the shield connections. If connecting
to an unbalanced source in this manner re-
sults in hum or noise, try connecting signal
high to +, and shield to –; leave the shield
connection unterminated.
It is highly recommended that at least one of
the surround inputs be wired by way of an
audio patch bay. This will allow the chan-
nels associated with that input source to be
easily rerouted. While signals generated
within a facility will normally follow a specifi c
format, such as left, right, center, LFE, left
surround, and right surround, it is possible
that media provided by an outside facility
will follow a different scheme.
Monitor Outputs
Two connectors are used to support the
two 6-channel (5.1 surround) monitor out-
puts. Please refer to Figures 8 and 9 for
details on the exact “pin outs” of the D-sub
connectors.
The monitor output channels are intended
for connection to audio amplifi ers associ-
ated with monitor loudspeakers, or to the
inputs of loudspeakers that contain inte-
grated amplifi ers. The monitor outputs are
electronically balanced and capable of
driving balanced or unbalanced loads of 600
ohms or greater. While balanced operation
is preferred, unbalanced operation does
not pose a problem. To connect to an unbal-
anced load connect the + terminal as signal
high, and both the – and shield as the signal
low/shield. For optimal unbalanced opera-
tion, it is important to connect both – and
shield together directly on the D-sub plug,
not at the other end of the harness.