Studio Technologies 81 User Manual
Page 10
Issue 1, January 2000
Model 81 User Guide
Page 10
Studio Technologies, Inc.
units operating voltage it must be
performed only at the factory or by an
authorized service technician.
The Model 81 uses an IEC standard con-
nector to mate with the AC mains cord.
The wire colors in the AC mains cord
should conform to the internationally
recognized CEE color code and must
be wired accordingly:
Connection
Wire Color
Neutral (N)
Light Blue
Line (L)
Brown
Protective Earth (E)
Green/Yellow
Safety Warning: The Model 81 does
not contain an AC mains disconnect
switch. As such the mains cord plug
serves as the disconnection device.
Safety consideration requires that
the plug and associated outlet be
easily accessible to allow rapid discon-
nection of mains power should it prove
necessary.
Signal
Signal
Connections
High (+) Low () Shield
OUTPUT-1L
24
12
25
OUTPUT-1R
10
23
11
OUTPUT-2L
21
9
22
OUTPUT-2R
7
20
8
OUTPUT-3L
18
6
19
OUTPUT-3R
4
17
5
OUTPUT-4L
15
3
16
OUTPUT-4R
1
14
2
Notes: 1) Connector type on Model 81 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.
Figure 1. Connections for Outputs 1-4
Signal
Signal
Connections
High (+) Low () Shield
OUTPUT-5L
24
12
25
OUTPUT-5R
10
23
11
OUTPUT-6L
21
9
22
OUTPUT-6R
7
20
8
OUTPUT-7L
18
6
19
OUTPUT-7R
4
17
5
OUTPUT-8L
15
3
16
OUTPUT-8R
1
14
2
Notes: 1) Connector type on Model 81 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.
Figure 2. Connections for Outputs 5-8
Note that while the Model 81s 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 approaches 600 ohms.
A 0.5dB difference in output level can be
expected as the load impedance changes
from 10k ohms to 600 ohms.
AC Mains Power
The Model 81 is internally configured to
operate from either 100, 120, or 220/240V,
50/60Hz. In most cases, units shipped to
North America are factory selected for
120V operation. Units bound for Japan are
selected for 100V, while our friends down
under and in Europe receive units set for
220/240V. Before connecting the Model 81
to AC mains power, check that it is config-
ured to match the local mains voltage.
Look on the back panel, adjacent to the
power entry connector, for the configured
voltage(s). Note that an incorrect configu-
ration could seriously damage the unit.
Should it be necessary to change the