Studio Technologies 58 1998 - Manual (Page 22)

Issue 2, April 1998 Model 58/59 User Guide
Page 22 Studio Technologies, Inc.
for Surround
allowing creation of an 8-channel monitor
system. In some special applications up to
eight Model 58 units can be used together,
utilizing unit ID numbers 1-8. (This is the
single-channel mode that will be discussed
in Appendix B.) Unit ID numbers 9-16 are
reserved for future applications, the likes
of which even we haven’t the foggiest idea
about—hopefully smart users like you will
come up with some cool ideas for us to
implement!
Model 58 Operating Mode
DIP switch position 5 is used to set the
Model 58 Central Controller’s operating
mode. In the off (down) position, the unit
operates in the normal 2-channel mode.
In the on (up) position, the unit operates
in a special single-channel mode. In the
2-channel mode each Model 58 supports
two output channels and four 2-channel
input pairs. This is correct for use with the
standard Model 59 Control Console. If this
is your application, ensure that DIP switch
5 is in the off (down) position.
The single-channel mode is provided for
special applications where the eight Model
58 input channels need to be routed to the
same output channel. Contact Studio
Technologies for details.
After the Model 58 unit ID and operat-
ing mode configurations have been set,
the AC mains power for all units must
be simultaneously disconnected, then
reconnected. This ensures that the
previous configuration is completely
erased and the new one is correctly
implemented.
Level Calibration
Fourteen multi-turn trim potentiometers
grace the front panel of the Model 58
Central Controller. Eight are provided for
the line inputs, four for the insert returns,
and two for the monitor outputs. Taking
time to carefully adjust the trim pots will
ensure that accurate monitoring can take
place. Each trim pot allows an adjustment
range of ±2dB, which is spread over the
trim pot’s 15 turns. Calibrating the levels
down to a tenth of a dB is easily per-
formed.
The meter outputs are used as the mea-
suring point when adjusting 12 of the trim
pots. Unless precision level meters are
already connected to the meter outputs,
a laboratory-grade audio level meter is
required. In addition, the audio sources
connected to the line inputs must be
configured to generate steady signals at
their nominal operating level. Those inter-
ested in where the trim pots are located
in the circuitry, and why the meter outputs
are specified as the main measurement
point, should refer to the Model 58 Block
Diagram, located at the end of this guide.
Input Trim Pots
This first procedure will ensure that all
Model 58 line inputs are level matched
against each other. The audio sources
connected to these inputs are normally
arranged as four 2-channel pairs; 1 and 2,
3 and 4, 5 and 6, 7 and 8. The trim pots
will be adjusted in pairs corresponding to
the input sources. In this procedure it is
assumed that precision metering devices
are not connected to the meter outputs.
1. On the first Model 58, connect the
audio level meter to meter output 1.