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By monitoring the operating condi-
tion of amplifiers with the IQ System
software, the need for additional
cooling would be apparent. The
same software could then be used
to turn on the appropriate AUX con-
nector. (For more information about
turning the auxiliary feature on/off,
consult the IQ for Windows software
documentation.)
5.2.2 AUX Input
Depending on the IQ software be-
ing used, the AUX connector can be
used to sense the presence of an
input signal across pins 2 (+) and 5
(ground). A +5 to +15 VDC signal at
the input will be interpreted as a
logic "high" and will be communi-
cated to the IQ Bus where a host
computer or controller can act upon
it. A signal less than +1.6 VDC is
interpreted as a logic "low."*
5.3 Listen Bus
Use the diagram in Figure 5.3 to con-
nect an audio monitoring system, such
as a headphone preamp, to the IQ-
MC Listen Bus.
Figure 5.3
Listen Bus Connection
* A negative signal can also be used as a
logic low because the signal is internally
clamped to protect the internal circuitry.
Page 20
Figure 5.4 demonstrates how mul-
tiple amplifiers can be monitored
using the Listen Bus. Crown's IQ for
Windows software allows you to se-
lect the amplifier and channel you
wish to monitor.
Amp 1
Amp 2
Figure 5.4 Multiple-Amp
Listen Bus Configuration
5.4 Working with RJ-11 and
RJ-45 Connectors
Pin assignments for standard RJ-11
and RJ-45 connectors are indicated
in Figure 5.5.
Figure 5.5 RJ-11 & RJ-45
Pin Assignments
IQ-MC Modules
Reference Manual
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