Studio Technologies 750 - Manual (Page 14)

Issue 3, May 1997 Model 750 User Guide
Page 14 Studio Technologies, Inc.
Model 750
“bars and tone” position. For maximum
flexibility, it is recommended that these
signals be connected by way of the patch
bay. In this way they can be accessed for
test and calibration purposes.
The electronically-balanced, nominal
+4dBu outputs are accessible via two
¼-inch 3-conductor phone jacks. The
circuitry is capable of driving balanced or
unbalanced loads of 600 ohms or greater.
Prepare the mating connectors (plugs) so
that tip is signal high (+ or hot), ring is low
(– or cold), and sleeve is shield. To con-
nect to an unbalanced load connect the tip
to high (+ or hot), and both the ring and
sleeve to shield.
Two trim potentiometers are used to set
the output level of the setup direct output.
Refer to the Configuration section of this
guide for details.
External Monitor Inputs
Two external audio signals can be con-
nected, allowing them to be monitored
independently of the internal audio buses.
It is intended that the external monitor
inputs will be connected to outputs associ-
ated with off-air, microwave, or satellite
receivers. Both inputs are stereo, elec-
tronically balanced, and interface using
¼-inch 3-conductor phone jacks. External
Monitor Input 1 is compatible with signals
that have a nominal level of +4dBu. Exter-
nal Monitor Input 2 is compatible with
–10dBu or +4dBu signals. A DIP switch,
located on the front panel of the Model
750, is used to set the input sensitivity.
Refer to the Configuration section of this
guide for configuration details.
As an installation aid, a connection made
only to the jack labeled L/MONO routes
the signal to both the left and right input
circuitry. This allows a monaural signal to
be monitored in a 2-channel mono format.
If you wish to have a mono input con-
nected only to the left input, simply insert
an unterminated plug into the associated
right input jack. This will break the “nor-
mal” connections that link the left and right
input circuits.
Prepare the mating connectors (plugs)
so that tip is signal high (+ or hot), ring is
low (– or cold), and sleeve is shield. With
an unbalanced source connect the tip to
high (+ or hot), and both the ring and
sleeve to shield. If connecting to an unbal-
anced source in this manner results in
hum or noise, connect tip to high (+ or
hot) and ring to shield; leave the sleeve
unterminated.
Monitor Output
The monitor output is designed for con-
nection to an audio power amplifier asso-
ciated with a pair of monitor loudspeakers.
In mobile applications it may prove com-
mon for loudspeakers with internal amplifi-
ers, such as those from Fostex, to be
connected to the Model 750’s speaker
output. The outputs are electronically-
balanced, line-level, and can drive bal-
anced or unbalanced loads of 600 ohms
or greater.
The monitor output utilizes two ¼-inch
3-conductor phone jacks for interconnec-
tion. Prepare the mating connectors
(plugs) so that tip is signal high (+ or hot),
ring is low (– or cold), and sleeve is shield.
To connect to an unbalanced load con-
nect the tip to high (+ or hot), and both
the ring and sleeve to shield. Whether
these outputs are wired via the patch bay
will depend on the specific installation.