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Thermal: You can choose to be
warned if the thermal level rises above
a predetermined level. The Threshold
control lets you set the thermal level
above which an error message will be
reported. The range is from 1 to 100%.
Fault: You can choose to be warned
when an amplifier "fault" condition
occurs when a channel fails.
Load: You can choose to be warned
if the impedance of the load being
driven by the amplifier falls out of a
pre-selected range. See Section 4.5
for instructions on setting up the load
supervision feature.
Dual/Bridge Switch Changed: You
can choose to be warned if the Dual/
Bridge Switch setting has been
changed. This condition risks ampli-
fier damage or distortion. If you see
this error, manually set the Dual/Bridge
Switch to the correct position.
Attenuator Setting Changed: You
can choose to be informed that the
back-panel attenuator setting has
been changed since you set it up.
4.4 Signal Processing
4.4.1 Input Signal
Compressor/Limiter
An input signal compressor/limiter
is available for each channel. There
are five parameters which control
this feature:
On/Off: Turns this function on or off.
Threshold: Sets the threshold, in
dB, above which the compressor
acts. The level is measured at the
input to the module and corresponds
to the level shown on an input meter.
The compressor is "feed-forward,"
meaning that the level detection
Reference Manual
point is located before the gain con-
trol stage. The range is from +16
dBu to –40 dBu.
Attack Time: Sets the attack time of
the compressor. The attack time is
defined as the time it takes the com-
pressor to attenuate the input signal
by 10 dB. The range is from 1 milli-
second to 2 seconds.
Release Time: Sets the release time
of the compressor. The release time
is defined as the time it takes the
compressor to increase the input
gain by 10 dB. The range is 100
milliseconds to 30 seconds.
Compressor Ratio: Sets the com-
pression ratio for the compressor.
The range is 1, 2, 4, 8, 16, 32, ∞ to 1.*
4.4.2 Peak Voltage Limiter
This limits the peak voltage output of
the amplifier. There are four param-
eters which control this limiter.
On/Off: Turns the limiter on or off.
Attack: Attack time is adjustable
from 10 milliseconds to 100 millisec-
onds per 10 dB of overdrive.
Release: Release rate is adjustable
from 100 milliseconds to 10 sec-
onds per 10 dB or release.
Threshold: Absolute voltage thresh-
old is adjustable from 12 Vpk to 255
Vpk in 1 volt steps.
4.4.3 Average Power Limiter
Limits the long-term power output
from the amp. The actual output
limiter threshold is determined by
an absolute power threshold and
the nominal load impedance set-
ting. There are five parameters which
control this limiter.
* 1:1 is the same as "off."
IQ-MC Modules
Page 15
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