Studio Technologies 58 2000 - Manual (Page 17)

Issue 4, December 2000 Model 58/59 User Guide
Page 18 Studio Technologies, Inc.
for Surround
The same source, or sources, that feed
the monitor output feeds to meter output.
The major difference is that the meter
output is not affected by the monitor
output level control circuitry; it is pre-fader
(pre-VCA).
The meter output is intended for connec-
tion to the inputs of various mechanical,
electronic, or electromechanical meter
systems. These could range from conven-
tional analog “VU” or “PPM”-type meters,
to projection meter systems used in
motion picture applications. The meter
output can also serve as an additional
audio output for special applications, such
as a copy or “dub” output. In addition, the
meter output serves an important role in
the input calibration process, which is
discussed in the Configuration section of
this guide.
The meter output is unbalanced, has a
nominal level of +4dBu, and is capable
of driving loads of 600 ohms and greater.
Even if the meter output is not going to be
used during normal operation it is impor-
tant to provide access to it. To correctly
and accurately calibrate the system input-
to-output gain an audio level measurement
device must be able to be temporarily
connected to the meter output. While not
absolutely necessary, terminating or
routing the meter output to points on an
audio patch bay may prove very helpful
for long-term maintenance assistance.
Bypass Inputs
The connector labeled OUTPUTS pro-
vides access to the 2-channel bypass
input. Please refer to Figure 8 for details
on the exact “pin out” of the D-sub connec-
tor. It is usual for the source connected to
the bypass input to be from the stereo
monitor output of an audio console or
other monitoring system.
Warning: It is very important that
signals connected to the bypass
input be “post” a level control, i.e.,
attenuated from line level. Connect-
ing a standard line level audio signal
can result in damage to monitor
loudspeaker systems or, more impor-
tantly, to the ears of listeners.
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 the connection method
depends on the requirements of the moni-
tor speaker system’s input. This is be-
cause routing of the bypass input to the
monitor outputs does not involve any
active circuitry. Whenever the bypass
Signal Signal
Connection High (+) Low (–) Shield
SEND 1-1 24 12 25
RETURN 1-1 10 23 11
SEND 1-2 21 9 22
RETURN 1-2 7 20 8
SEND 2-1 18 6 19
RETURN 2-1 4 17 5
SEND 2-2 15 3 16
RETURN 2-2 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.
Figure 9. Connections for Inserts