Crown Audio IQ-P.I.P.-SMT - Manual (Page 15)

Page 15
IQ P.I.P.–SMT
such as a shorted speaker cable or
shorted loudspeaker. There are two
parameters which control this feature:
ODEP Short Detect: Turns this
function on/off.
ODEP: Sets the ODEP level
above which a short is
presumed to have occurred in
the load resulting in a warning
message being displayed. The
range is from 1 to 100%.
3.16 Fault Warning
Fault conditions can be monitored by
the
IQ System and a warning mes-
sage displayed on the host
computer’s screen if they occur. If
desired, the AUX port can also be
used to signal the presence of a
“fault” condition. An amplifier “fault”
condition occurs when a channel
fails. The symptoms are a normal in-
put signal, an
IOC condition that is
“locked” on, a high voltage supply
(VCC) that reports a normal condition
and no signal at the output of the
amplifier.
PIP2-compatible amplifiers
monitor a “fault” signal from the am-
plifier while standard
P.I.P.-compat-
ible amplifiers deduce a “fault”
condition from the aforementioned
symptoms. There are two parameters
which control this feature:
Fault: Turns this function on/off.
Input Drive Level: Sets the
threshold below which a fault
condition is presumed to exist in
a standard
P.I.P. amplifier. This
parameter is necessary
because it may be normal for an
IOC error to persist if the audio
input signal level is high.
Monitoring the input level can
help determine whether a fault
condition really exists or
plifier from “ ODEP limiting” the drive
level of the output devices as de-
scribed earlier. In the majority of
cases, limiting the input signal pro-
duces a very smooth sound. And
since the input signal is only limited
when and to the degree necessary, it
is very difficult to detect. There are
four parameters which control this
feature:
ODEP Conservation: Turns this
function on/off.
Trigger Level: Sets the ODEP
level, in percent, above which
the conservation limiting will
begin. The range is from 1 to
100%.
Amount: Sets the amount, in
dB, that the input signal level will
be attenuated for each
percentage point that the
ODEP
level exceeds the trigger level.
The settings for this parameter
are: 0.5 to 6.0 dB in ½ dB steps.
Release Time: Sets the release
time of the conservation limiter.
The release time is based on 10
dB of attenuation. For example,
a setting of 10 seconds will
result in the
IQ–P.I.P.–SMT taking
10 seconds to release 10 dB of
attenuation. The settings for this
parameter are: 0.2, 0.4, 0.6, 0.8,
1.0, 1.5, 2.0, 3.0, 4.0, 6.0, 8.0,
10, 12, 15, 20 and 30 seconds.
3.15 Excessive ODEP Warning
The user can set a “trigger” that will
cause a warning message to appear
on the host computer’s screen if the
ODEP level ever rises above a pre-
determined level. It is generally as-
sumed that a sudden rise in the
ODEP level would indicate a sudden
decrease in the load impedance—