Studio Technologies 58 1998 - Manual (Page 17)

Model 58/59 User Guide Issue 2, April 1998
Studio Technologies, Inc. Page 17
for Surround
noise, connect signal high to + on the
D-sub, and shield to – on the D-sub; leave
the shield connection on the D-sub
unterminated.
It is important that at least one of the
multi-channel inputs be wired by way of an
audio patch bay. This will allow the chan-
nels associated with an input source to be
easily rerouted. While signals generated
within a facility will usually follow a specific
format, such as L, C, R, LS, RS, Sub, it is
possible that media provided by an outside
source will follow a different one.
Outputs
The connector labeled OUTPUTS pro-
vides access to the two, 2-channel monitor
outputs and the 2-channel meter output.
Please refer to Figure 8 for details on the
exact “pin out” of the D-sub connector.
The monitor outputs are intended for
connection to audio amplifiers associated
with monitor loudspeakers, or to the inputs
of loudspeakers with integrated amplifiers.
Note that there are two monitor output
circuits which are switched, using relays,
to the 2-channel A and B output connec-
tions. Under normal operation only one
set of outputs, A or B, will be active at
the same time. The output which is not
active has a short-circuit placed across
its connections.
Note: While the electronically balanced
output circuits are capable of driving
loads of 600 ohms or greater, the out-
put level will drop slightly as the load
impedance approaches 600 ohms. A
0.5dB difference in output level can
be expected as the load impedance
changes from 10k ohms to 600 ohms.
This applies to all of the electronically
balanced output circuits provided on
the Model 58.
The monitor outputs are electronically
balanced and are capable of driving bal-
anced 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 of the
D-sub as signal high, and both the – and
shield as the signal low/shield. For optimal
unbalanced operation, it is important to
connect both – and shield together directly
on the D-sub, and not at the other end of
the harness.
The same source, or sources, that feed
the monitor outputs are fed to meter out-
puts. The major difference is that the
meter outputs are not affected by the
Signal Signal
Connection High (+) Low (–) Shield
MONITOR A-1 24 12 25
MONITOR A-2 10 23 11
MONITOR B-1 21 9 22
MONITOR B-2 7 20 8
METER 1 18 6 (See Note 3) 19
METER 2 4 17 (See Note 3) 5
NOT USED 15 3 16
NOT USED 1 14 2
Notes: 1) Connector type on Model 58 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 loosely follows Tascam
DA-88 convention. Modified DA-88-type wiring
harnesses are required, along with 4-40 screw
threads.
3) Meter outputs are unbalanced. Pins 6 and
17 internally connected to Model 58 shield.
Figure 8. Connector Pin Out for Outputs