Studio Technologies 591 - Manual (Page 9)

Issue 1, September 1999 Model 58/591 User Guide
Page 12 Studio Technologies, Inc.
by Studio Technologies. Note that our
friends in some locations may use the
term “loom” instead of harness.
Main Inputs
The connector labeled INPUTS is used to
interface the audio sources with the eight
main input circuits. Note that when used
with the Model 591 Control Console, main
inputs 5-8 are not supported. Please refer
to Figure 4 for details on the exact “pin
out” of the D-sub connector. The electroni-
cally balanced circuitry is intended for
connection to balanced or unbalanced
sources with a nominal signal level of
+4dBu. A trim potentiometer is associated
with each main input, allowing adjustment
of the input sensitivity over a ±2dB range.
The configuration sections of this guide
provides details on using the trim pots.
Balanced sources should be wired so that
signal high is connected to + on the D-sub,
signal low to – on the D-sub, and shield to
the D-sub’s shield connection. With an
unbalanced source connect signal high to
the + connection on the D-sub, and shield
to both the – and the shield connection on
the D-sub. If connecting to an unbalanced
source in this manner results in hum or
noise, connect signal high to + on the
D-sub, and shield to – on the D-sub;
leave the shield connection unterminated.
Monitor Outputs
The connector labeled OUTPUTS
provides access to the two, 2-channel
monitor outputs. Please refer to Figure 5
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. During operation only one set of
outputs, A or B, will be active at the same
time. An output which is not active has a
short-circuit placed across
its connections.
Note: While the Model 58’s electroni-
cally balanced output circuits are
capable of driving loads of 600 ohms
or greater, the output level will drop
slightly as the load impedance ap-
proaches 600 ohms. A 0.5dB differ-
ence 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.
Signal Signal
Connection High (+) Low (–) Shield
MAIN IN 1 24 12 25
MAIN IN 2 10 23 11
MAIN IN 3 21 9 22
MAIN IN 4 7 20 8
MAIN IN 5 (Note 3) 18 6 19
MAIN IN 6 (Note 3) 4 17 5
MAIN IN 7 (Note 3) 15 3 16
MAIN IN 8 (Note 3) 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 follows Tascam DA-88
convention. Standard DA-88-type wiring
harnesses are directly compatible, with the
exception of 4-40 screw threads being
required.
3) Main inputs 5-8 are not supported by the
Model 591 Control Console.
Figure 4. Connections for Main Inputs