Studio Technologies 740 - Manual (Page 9)

Model 740 User Guide Issue 3, May 2004
Studio Technologies, Inc. Page 9
Model 740
to adjust its volume. This prevents the
confusing situation of having two level
controls—the Model 740’s level control
and the amplified speaker’s level con-
trol—both impacting the speaker level.
In this case the Model 740’s front-panel
control will only impact the headphone
output level.
Meter Source
The meter source can be configured
to operate from one of two modes:
• From the factory the meter is selected
to always monitor the level of the main
output bus. This ensures that the level
of the active or “on-air” output is always
displayed on the meter. Changing the
monitor source will not impact meter
operation.
• An alternate jumper setting allows the
meter to “follow” the source selected for
monitor output. This could prove useful
if level metering of the external monitor
input signals is desired.
Reference Tone Frequency
From the factory the frequency of the
reference tone is configured to be 400 Hz.
This is a nice alternative to the more
typical 1 kHz, a frequency which can soon
become very annoying to a listener’s ears.
In most cases 400 Hz will be perfectly
acceptable, and actually preferred. But
in those situations where 1 kHz is neces-
sary, configuration jumpers can shift the
frequency range so that the oscillator
circuitry can be calibrated for 1 kHz.
Configuration Wrap-Up
If it is determined that any configuration
changes are required, they should now
have been performed. For specific details
on how to make configuration changes,
refer to the Technical Notes section of
this guide. The details provided should
have made the process simple and
relatively painless.
Installation
In this section, the Model 740 will be
installed in an equipment rack. Input and
output connections will be made using
the Model 740’s multitude of jacks. Finally,
AC mains power will be connected.
System Components
The shipping carton contains a Model 740
Audio Mixer and user guide. Units des-
tined for North America and Japan also
include an AC mains cord. Your dealer
or distributor will provide an AC mains
cord for non-North American destinations.
Locating the Unit
Now that the Model 740’s configura-
tion has been reviewed and, if required,
revised, the unit can be mounted in an
equipment rack. Physical access and
viewing angles are the primary issues
to be considered when choosing a mount-
ing location. By its very nature as an audio
mixer, an operator will need easy access
to all the controls. Also, a good sight line
to the 10-segment LED level meter, locat-
ed on the right side of the front panel, can
be important.
As a device that contains high gain audio
stages, hum and noise pickup is possible
by way of the chassis and associated ca-
bling. Locating the unit away from devices
that radiate strong AC fields is an excellent
idea. While not likely, it is also possible
that the Model 740’s toroidal power trans-
former could radiate energy into adjacent