Studio Technologies 742 2005 - Manual (Page 9)

Model 742 User Guide Issue 2, May 2005
Studio Technologies, Inc. Page 9
Model 742
Phantom Power
In most broadcast news applications,
phantom-powered condenser micro-
phones are not utilized. However, excep-
tions do arise and the Model 742 does
allow 12-volt phantom power to be
supplied to the four mic/line input chan-
nels. One configuration jumper is used to
select the phantom power on/off status for
all four channels; independent control is
not provided. From the factory phantom
power is selected to be off. Note that if
phantom power is enabled, it is only active
when a mic/line input channel’s sensitivity
switch is set to its “mic” (out) position.
Compressor Modes
The compressor circuits associated with
the two output buses can be configured
to operate from one of three modes:
• From the factory the compressors are
set to have an operating threshold of
6 dB above the main outputs’ nominal
+4 dBu operating level. In other words,
the compressors will begin to function
whenever the main output levels reach
about +10 dBu, as measured on the
output connectors. This is an excellent
general-purpose setting that is appro-
priate for most applications.
• Alternately, the compressors’ threshold
can be changed to be 2 dB above the
nominal +4 dBu operating level. This
may be appropriate for applications
where an RF transmission chain places
severe restrictions on the audio signal’s
dynamic range.
• While not recommended for most ap-
plications, the compressors can also
be configured to be disabled. With this
configuration, no dynamic range control
will take place. For most on-air applica-
tions this is probably not appropriate.
Take advantage of the Model 742’s
highly effective dynamic range control
to assist in providing clear, intelligible
audio!
Monitor Output Modes
The line-level monitor outputs can be
configured to operate from one of three
modes:
• From the factory the monitor outputs
are set to follow the position of the front-
panel rotary level controls. This mode of
operation is referred to as being “post”
the level controls.
• An alternate configuration is specifically
provided for use in applications where
amplified loudspeakers with built-in
user level controls are connected. This
“pre” level-control mode provides fixed
nominal output levels of –10 dBu. This
prevents the confusing situation of hav-
ing multiple level controls—the Model
742’s and the amplified speakers’—
both impacting the level of a speaker.
In this case the Model 742’s front-panel
controls will only impact the headphone
output.
• A third configuration provides a “pre”
level-control mode with a fixed nominal
output level of +4 dBu. This can be
useful for applications where an ad-
ditional set of main outputs is required.
Except for using ¼-inch 3-conductor
jacks (versus XLR-type) the monitor
outputs are identical in quality as com-
pared to the main outputs. Again in
this mode the Model 742’s front-panel
controls will only impact the headphone
output.