Studio Technologies 58 2000 - Manual (Page 15)

Issue 4, December 2000 Model 58/59 User Guide
Page 16 Studio Technologies, Inc.
for Surround
58s to be interconnected. Refer to Figure
4 for a diagram depicting the interconnec-
tion of four Model 58 units. Each Model 58
contains a 9-pin D-sub connector labeled
LOOP THRU. Use the bus assembly to
link these connectors together. Locking
hardware for the plugs is not included as it
is unnecessary for reliable interconnection.
(If you are the compulsive type, the D-
subs on the Model 58 use 4-40 threads.)
Audio Connections
Audio signal connections on each Model
58 unit are made by way of three 25-pin
D-sub connectors. Three cable harnesses,
each with a 25-pin D-sub plug (male) on
one end and the desired connectors on
the other end, are necessary. These cable
harnesses are not supplied by Studio
Technologies. Note that our friends in
some locations may use the term “loom”
instead of harness.
The three 25-pin D-sub connectors are
utilized for audio input, insert, and output
interconnections. The main inputs can
interface using a standard DA-88-style
input cable harness. The other two 25-pin
D-sub harnesses use a wiring scheme
slightly different from the “DA-88 stan-
dard.” For example, a harness supporting
the monitor outputs, meter outputs, and
bypass inputs could have the first six
channels using XLR-type plugs (males)
and the last two channels using XLR-type
connectors (females).
Main Inputs
The connector labeled INPUTS is used
to interface the audio sources with the
eight main input. Refer to Figure 7 for
details on the exact “pin out” of the D-sub
connector when used in the normal 2-
channel operating mode. In this mode the
eight main inputs are used as four 2-
channel input pairs. Refer to the Configu-
ration section for details.
The electronically 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
Signal Signal Input
Connection High (+) Low (–) Shield Pair
MAIN IN 1 24 12 25 1-1
MAIN IN 2 10 23 11 1-2
MAIN IN 3 21 9 22 2-1
MAIN IN 4 7 20 8 2-2
MAIN IN 5 18 6 19 3-1
MAIN IN 6 4 17 5 3-2
MAIN IN 7 15 3 16 4-1
MAIN IN 8 1 14 2 4-2
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) The column labeled “Input Pair” shows how
the inputs are arranged in the 2-channel mode
Figure 7. Two-Channel Mode Connections for
Main Inputs