Studio Technologies 591 - Manual (Page 16)

Model 58/591 User Guide Issue 1, September 1999
Studio Technologies, Inc. Page 19
8. If insert 2 is being utilized, repeat the
procedure for its two return trim pots.
Monitor Output Trim Pots
A trim potentiometer is associated with
each of the two monitor output circuits.
Note that while there are two 2-channel
monitor output connections—A and B—
there are only two output circuits. Relay
contacts are used to switch the output
circuits between the A and B connections.
Installation-specific requirements will
dictate how the monitor output trim pots
need to be adjusted. In most cases the
trim pots will be adjusted to give exactly
the same output level on the two monitor
output channels. Other installations may
require the trim pots to be adjusted in
reference to the outputs of the audio
power amplifiers. For this discussion, we’ll
describe how to match the output levels of
the monitor outputs. Note that this proce-
dure assumes that input calibration has
already been performed.
1. Start by turning off the AC mains
power on the audio power amplifier. If
loudspeakers with integrated amplifiers
are being used, turn them off too. This
“power down” is critical, ensuring that
high-level test signals do not get sent
to the loudspeakers. Don’t mess
around—turn off the amps now!
2. Confirm that the audio source con-
nected to main input 1 is generating a
steady signal at precisely its reference
level.
3. Using the Model 591 Control Console,
select main input 1 as the audio
source for the left and right monitor
outputs. Ensure that other inputs are
off. Enable monitor output A. Confirm
that inserts 1 and 2, as well as the
mute all and dim functions are disabled.
Slowly turn the rotary level control
clockwise. If audio is heard, stop raising
the level and turn off any active amplifi-
ers. Turn the level control until it is fully
clockwise, providing the maximum
monitor output level.
4. Connect the precision audio level
meter to channel 1 of monitor output A.
5. Observing the level meter, adjust
monitor output trim pot 1 to give
exactly +4dBu.
6. Disconnect the level meter and connect
it to channel 2 of monitor output A.
7. Observing the level meter, adjust the
monitor output 2 trim pot to give
exactly +4dBu.
8. On the Model 591 Control Console,
turn the output level control to the fully
counterclockwise position.
9. After confirming that the level control
is fully counterclockwise, activate AC
mains power on the audio amplifier
or amplified speakers.
Model 591 Operating
Parameters
Many StudioComm functions can be config-
ured to meet the exact needs of your instal-
lation. Here’s an overview of what you can
configure:
• Input source presets
• Insert operation
• Monitor output mode
• Power-up mute mode
• Channels selected for bypass and
bypass mode