Studio Technologies 50 2000 - Manual (Page 36)

Issue 4, July 2000 Model 50/51 User Guide
Page 36 Studio Technologies, Inc.
Power Amplifier Input Sensitivity
Optimum StudioComm performance is
obtained when the input sensitivity of the
control room and studio power amplifiers
are adjusted to match the Model 50’s
output level. With normal, but loud, listen-
ing levels you should find the level potenti-
ometers on the Model 51 to be set to
about 2 o’clock. If you find that you don’t
have to turn up the Model 51’s controls
that high, reduce the input sensitivity of the
power amplifiers until you get to the
2 o’clock position. Most power amplifiers
have controls on their inputs to allow easy
adjustment of the input sensitivity.
Control Room and Studio Output
Transient Protection
Unique to the Model 50 Central Controller
is a power up/power down transient pro-
tection feature. This limits the chance of
damage to the control room and studio
loudspeakers during the time when AC
mains voltage is connected, disconnected,
or has significantly changed from nominal.
A combination of hardware and software
are used to monitor one of the power
supply “rails.” Until the power supply
exceeds 81% of its nominal voltage, elec-
tromechanical relays maintain a short
circuit condition on the control room A and
B outputs and the studio outputs. After a
one-second delay the relays are released
to function normally. Whenever the power
supply 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.