Crown Audio IQ-P.I.P.-SLM - Manual (Page 20)

Page 20
IQ–P.I.P.–SLM Programmable Input Processor with Load Monitoring for IQ Systems
Reference Manual
The internal AUX circuit is shown below in Figure 4.10:
The AUX connector is a 3-pin removable Eurostyle bar-
rier block connector. The OUT and
(GND) pins are
used to send a signal and the IN and (GND) pins
are used to receive a signal .
4.9.1 Triggering a Test (AUX Input)
The AUX input is a high-impedance (10 K ohm) input.
To trigger a test with it you must do two things: 1) Use
IQ software to set the
IQ–P.I.P.–SLM to respond to a
logic “high” at the AUX input; and 2) Connect an exter-
nal voltage (TTL level) to the AUX input across the IN
and
(GND) pins. A +5 to +15 VDC signal will be
recognized as a logic high. A signal less than +1.6 VDC
or an electrical open will be interpreted as a logic “low.”
See the IQ software
User Manual for instructions on
configuring the IQ–P.I.P.–SLM to respond to the AUX
input.
Note: A negative signal can also be used as a logic low
because the signal is internally clamped to protect the
internal circuitry.
4.9.2 Signaling a Failed Test (AUX Output)
When the AUX output is turned on, +15 VDC is sup-
plied across the OUT and
(GND) pins. A total of 15
milliamps of current is available. A 1.5 K ohm resistor
protects against shorts.
The IQ–P.I.P.–SLM can be configured by the IQ soft-
ware to signal a failed test via the AUX output. It does
this with reverse logic. The AUX port will be turned on
to indicate that all channels have passed the most re-
cent test and turned off to indicate that one or more
We strongly recommend that balanced wiring be used
if possible. Some important guidelines follow:
• Always use shielded wire. The higher the density
of the shield (the outer conductor), the better.
Spiral wrapped shield is not recommended.
• When using unbalanced lines, keep the cables
as short as possible. Avoid lengths greater than
10 feet (3 meters).
• Do not run audio input cables together with high-
level wiring such as loudspeaker wires or AC
cords. (This lessens the chance of hum or noise
being induced into the input cables.)
• Do not connect audio and data grounds to-
gether. For example, do not connect the audio
ground to the Crown Bus ground.
• Turn the entire sound system off before chang-
ing any connections. Turn the level controls
down before powering the system back up.
Crown is not liable for damage incurred when
any transducer or component is overdriven.
IMPORTANT: Do not feed a signal into the phone jacks
on the back panel of the amplifier (if provided). The
phone jacks are wired in parallel with the output of the
P.I.P. connector inside the amplifier. Any audio signal
fed into the phone jacks could feed back into the out-
put of the
IQ–P.I.P.–SLM and generate a distorted input
signal. The phone jacks can be used to “daisy chain”
the post-processed signal from the
IQ–P.I.P.–SLM to the
inputs of other amplifiers.
DO NOT USE THE CHANNEL 2 INPUT if the amplifier
is used in either Bridge-Mono or Parallel-Mono mode.
For additional information on audio input connection
please refer to the amplifier’s
Reference or Owner’s
Manual. It contains helpful information on preventing
unwanted subsonic frequencies, radio frequency inter-
ference, ground loops, and feedback oscillation.
4.9 Using the AUX Connector
The IQ System offers tremendous flexibility and the
AUX connector provides a means of tapping into it. For
example, the AUX input can be used to trigger a test
and the AUX output can be used to signal that one or
more channels have failed an impedance and/or fre-
quency response test. Both of these features must be
configured via IQ software.
The AUX port can also function like a traditional IQ AUX
port. For example, the AUX output can be used to
switch a relay that can turn on/off other non-IQ compo-
nents in the system.
Fig. 4.10 The Internal AUX Circuit
IN
OUT
AUX
CONNECTOR
GND
1.5 K ohm
+15 V
INTERNAL AUXILIARY
CIRCUITRY
20 K ohm
20 K ohm