Studio Technologies 740 - Manual (Page 19)

Model 740 User Guide Issue 3, May 2004
Studio Technologies, Inc. Page 19
Model 740
A rotary control sets the output level of
the headphone outputs and, depending
on the Model 740’s configuration, may
also control the level of the monitor output
loudspeaker. Understanding and becom-
ing comfortable with using the monitor
section is important in obtaining optimal
Model 740 performance.
Source Selection Switch
A 3-position toggle switch is used to select
which one of the three audio sources is to
be monitored. The three possible sources
are:
• MAIN: When the handle is in the middle
position the Model 740’s main output
is selected as the monitor source.
• EXT 1: When the handle is in the up
position external monitor input 1 is
selected as the monitor source.
• EXT 2: When the handle is in the down
position external monitor input 2 is
selected as the monitor source.
Level Control
The rotary control is always used to adjust
the output level of the front- and back-
panel headphone outputs. Depending
on how the monitor output mode is con-
figured, the rotary control may also con-
trol the level of a connected loudspeaker.
There are three ways that the monitor
output can be configured:
• From the factory the monitor output is
configured to “follow” the position of
the level control on the front panel. In
addition, the monitor output is muted
whenever a plug is inserted into the
front-panel headphone jack. In this
mode the front-panel control is used to
adjust the level of both the loudspeaker
and, if connected, headphones.
• An alternate configuration allows the
level of the monitor output to be con-
trolled by the front-panel rotary control.
However, plugging into the front-panel
headphone jack will not cause the
monitor output to mute. In this way
both the monitor loudspeaker and
connected headphones can be active
simultaneously. The level of both the
loudspeaker and the headphones will
be controlled by the rotary control.
• A third configuration mode takes the
Model 740’s front-panel level control
out of the picture vis-à-vis the moni-
tor output. The rotary control will still
adjust the level of the front- and back-
panel headphone jacks. With this
mode the level control on the amplified
loudspeaker is used to adjust the loud-
speaker level.
Headphone Outputs
The two headphone outputs are designed
to work well with virtually any of the con-
temporary medium- and high-impedance
stereo headphones. Sony headphones
were used during the design of the Model
740; their high sensitivity made them go
“way loud”! (While a bit “bright” in the
high-end for our taste, their comfort and
fine design make them a good choice for
use with the Model 740.) The headphone
outputs are also compatible with monaural
“ear buds” that are commonly used for
IFB feeds to reporters and other “on-air”
talent. Selecting an ear bud impedance of
2 k ohms or greater is preferable, although
almost any will work.
Independent output circuitry is used for
the front- and back-panel headphone
outputs. Thus ’phones plugged into the
front-panel jack will not impact a connec-
tion made to the back-panel jack. The