Studio Technologies 591 - Manual (Page 32)

Model 58/591 User Guide Issue 1, September 1999
Studio Technologies, Inc. Page 35
“Hot” Disconnection of the Model 591
Control Console
Should you need to relocate the Model
591 while your StudioComm system is
operating, there is no reason why you
can’t disconnect the cable, move the unit,
and then connect it again. If the Model 591
is disconnected while it is operating, the
current operating parameters are saved in
nonvolatile memory and the Model 58
Central Controller will continue to operate
as when the link was broken. No clicks,
pops, or other noises will occur when the
Model 591 is again connected. The Model
591 will go through its standard power-up
sequence, send a message to reset
power-up defaults, then send the operat-
ing parameters as stored in its memory.
You may notice a brief interval of silence
while the Model 58 responds to the reset
defaults and operating parameter mes-
sages.
Power Amplifier Input Sensitivity
Optimum StudioComm performance is
obtained when the input sensitivity of the
associated audio power amplifier (or
amplified loudspeakers) is adjusted to
match the Model 58’s monitor output level.
With normal, but loud, listening levels you
should find the level potentiometer on the
Model 591 set to about the “2-’clock”
position. If you find that you don’t have to
turn up the Model 591’s control that high,
reduce the input sensitivity of the power
amplifier until you get to the 2-o’clock
position. Most power amplifiers, or ampli-
fied loudspeakers, have controls on their
inputs to allow easy adjustment of the
input sensitivity.
Monitor Output Transient Protection
The Model 58 Central Controller contains
a power-up/power-down transient protec-
tion feature. This limits the chance of
damage to the monitor loudspeakers
during the time when AC mains voltage
is connected, disconnected, or has signifi-
cantly changed from nominal. A combina-
tion of hardware and software is used to
monitor one of the Model 58’s power
supply “rails.” Until the DC voltage ex-
ceeds 81% of its nominal, electromechani-
cal relays maintain a short circuit condition
on the A and B outputs. After a short delay
the relays are allowed to function normally.
Whenever the DC voltage drops below
79% of its nominal voltage, the relays
immediately go to their mute state. During
testing it was found that upon power-up
the outputs remained very quiet; during
power down a moderate “tick” was the
worst that was heard.