poly-planar IMR-4 User manual

IMR-4 I/O Interface Module 1
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1095 Mearns Rd. Warminster PA 18974 TEL [phone]
poly-planar
Waterproof Marine Audio
IMR-4 Auxiliary Input / Output Interface Module
Introduction:
The IMR-4 is designed to interface to the Audio Expansion Port™ of the Poly-
Planar line of Audio Centers. It provides 2 Auxiliary inputs, a fixed level Pre-
amp line output, and both front and rear variable line level outputs. All inputs
and outputs are stereo (Left + Right). The Auxiliary input channels can be
configured to accept line level, or high level (power amplifier output) signals.
Differential input circuits are used to minimize interference, and to isolate
grounding for connections from bridged mode amplifiers. Refer to the
specification section for details on signal levels and limitations.
Uses
Some of the possibilities enabled with the IMR-4 include:
Connect audio from TV, VCR or DVD
Connect audio from portable MP3, cassette, or CD player
Connect audio from VHF Radio or any other Boat electronics
Provide output for external subwoofer
Provide output for external powered loudspeakers
Provide output for separate audio zone with independent volume
Provide output for headphone connection (requires external
headphone booster)

IMR-4 I/O Interface Module 2
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1095 Mearns Rd. Warminster PA 18974 TEL [phone]
poly-planar
Waterproof Marine Audio
INSTALLATION INSTRUCTIONS
Connecting to the Audio Center:
1) Gain access to the rear side of the Poly-Planar Audio Center.
2) Be sure to remove power from the Audio Center. This is important to
avoid damage during connection. In addition, the Auxiliary input
circuits will not become active unless power is removed from the Audio
Center during connection.
3) You may already have other Expansion modules connected to your
Poly-Planar Audio Center. Each Expansion Module is assigned a
priority code in order to insure proper audio routing. Expansion
Modules are designed to connect together in a bus fashion. The IMR-
4 is a priority [B3] device meaning that it would connect after any [A]
series devices, after a [B1] or [B2], but before a [B4], [C] or any
subsequent designation. The order of the devices is important to
insure proper functioning of all devices. If the IMR-4 is your only
expansion device then it can connect directly to the Audio Center.
4) Connect the IMR-4 in the proper location making sure that the ears on
the locking 26 pin connector are latched, and the blue protective tape
is removed from any connectors that need to be used.
(figure 1)
Expansion
Connector
Audio Center
back panel
Device 1
Device 2
.....etc.
A3
...etc.
. . . .
. . . .
Observe
Priority Order
Example of multiple
device connections and
order
B1
B3
C2

IMR-4 I/O Interface Module 3
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1095 Mearns Rd. Warminster PA 18974 TEL [phone]
poly-planar
Waterproof Marine Audio
Connecting Audio Inputs and Outputs:
5) The connection pigtails use standard RCA type connectors. Remove
the red and white caps before making a connection. Leave the caps in
place on any unused connectors.
6) Good quality, shielded cables should be used for all connections to
and from the IMR-4
7) It is recommended to use vinyl electrical tape around the RCA jacks
for any permanent connections to protect contacts from moisture and
to insure that the connection cannot vibrate loose.
(figure 2)
From TV,
VCR, DVD,
Etc.
From MP3,
Cassette
Player, Etc.
To powered
Subwoofer,
amplifier,
Etc.
To receiver,
Tape deck,
Etc.

IMR-4 I/O Interface Module 4
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1095 Mearns Rd. Warminster PA 18974 TEL [phone]
poly-planar
Waterproof Marine Audio
Configuring the IMR-4
8) The IMR-4 has a bank of 6 DIP Switches. Access the switches by
pulling back the clear adhesive tab over the rectangular access hole.
Use a small screwdriver or pen tip to slide the switches on or off. Be
sure to replace the tab after setting the switches. Settings are as
follows:
a. Switch 1 enables the AUX-1 input. Set this switch in the OFF
(Down) position if you do not intend to connect any device to
the AUX 1 input.
b. Switch 2 enables the AUX-2 input. Set this switch in the OFF
(Down) position if you do not intend to connect any device to
the AUX 2 input.
c. Switch 3 and 4 select the input sensitivity for the AUX-1 input.
Set these switches in the OFF (Down) position if you are
connecting a line level output device (line output from TV or
MP3). Set these switches ON (Up) if connecting from a
loudspeaker output (headphone jack or receiver speaker
output).
d. Switch 5 and 6 select the input sensitivity for the AUX-2 input.
Set these switches in the OFF (Down) position if you are
connecting a line level output device (line output from TV or
MP3). Set these switches ON (Up) if connecting from a
loudspeaker output (headphone jack or receiver speaker
output).
(figure 3)
1 2 3 4 5 6
ON
AU-1 enable
AU-2 enable
AU-1 Left in
level
AU-1 Right
in level
AU-2 Left in
level
AU-2 Right
in level

IMR-4 I/O Interface Module 5
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1095 Mearns Rd. Warminster PA 18974 TEL [phone]
poly-planar
Waterproof Marine Audio
Operation
9) With the IMR-4 connected to the Audio Center, re-connect power, turn
on the unit and press the SOURCE button until the display indicates
AU-1 or AU-2. The SOURCE button will cycle through all available
program sources in the following order TUNER -> CD PLAYER ->
CD CHANGER -> AU-1 -> AU-2. If AU-1 or AU-2 does not appear
then it is likely that switch 1 or 2 are in the off position. NOTE: after
changing switch 1 or 2 it is necessary to reset the Audio Center by
either removing all power from the unit, or pressing the RESET button
through the tiny hole on the bezel behind the front panel.
10) The Line outputs are always active when the IMR-4 is connected and
there are no special indicators on the Audio Center to control these
output separately.
Mounting
11) The IMR-4 should be mounted to a flat surface as close to the Audio
Center as possible. It should be mounted in an area that is free from
dripping water. There are 2 tabs on the plastic case that can be used
for screw mounting, or the unit can be fixed using a durable double-
stick foam tape.
12) The cables should be dressed as neatly as possible and should be
kept clear of other vehicle wiring. Fold or coil any excess length of the
gray flat-cable. Long runs of audio cables can be very sensitive to
interference so care must be taken to route them away from high-
current carrying wires

IMR-4 I/O Interface Module 6
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1095 Mearns Rd. Warminster PA 18974 TEL [phone]
poly-planar
Waterproof Marine Audio
Specifications
13) Aux 1 and Aux-2 Inputs
a. Input Impedance: 10 Kohm (Line level input)
1 Kohm (Speaker level input)
b. Input Level: 0.5 –1.5 VRMS (Line level input)
1.5 –7.0 VRMS (Speaker level input)
c. Fixed Output Level: 1 VRMS
d. Variable Output Level: 0 –1 VRMS
e. Output Minimum load: 300 ohm
Troubleshooting
14) Audio Center will not select AU-1 (or AU-2) as desired
a. Check to make sure the configuration switch is set to the ON
position and all connectors on the gray ribbon cable are firmly
seated.
b. Reset the Audio Center by either pushing the reset switch
using a pin, or by removing power to the unit. Remove power
by either disconnecting the entire Audio Center 12 pin harness
or disconnect the vehicle battery for 10 seconds.
15) AU-1 (or AU-2) appears on Audio Center although this input is unused
or unwanted
a. Set switch for unwanted Aux channel to OFF position.
b. Reset the Audio Center by either pushing the reset switch
using a pin, or by removing power to the unit. Remove power
by either disconnecting the entire Audio Center 12 pin harness
or disconnect the vehicle battery for 10 seconds.

IMR-4 I/O Interface Module 7
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1095 Mearns Rd. Warminster PA 18974 TEL [phone]
poly-planar
Waterproof Marine Audio
16) Signal seems too loud and/or distorted when AU-1 or AU-2 program is
selected
a. The input signal level may not be properly matched to the
input sensitivity of the IMR-4. If your source is connected
using a line level output then try adjusting the volume from the
source equipment. The level should be set such that AUX
input has the same apparent loudness as the radio or CD
source in the Audio Center.
b. If connected to a loudspeaker or headphone output, be sure
that both input sensitivity switches are set to ON for the
desired channel. For Aux 1 channel set switches 3&4 to ON,
for Aux 2 set switches 5&6 to ON.
17) Signal is too quite when AU-1 or AU-2 program is selected
a. Be sure that input sensitivity switches are set to the OFF
position for the selected channel (AU-1 or AU-2)
b. Adjust the volume on your source equipment. Many devices
use a variable output and require that the volume be set nearly
to Maximum in order to achieve line level output. With most
TVs it is possible to defeat the internal loudspeaker
18) Hum or noise interference is audible when AU-1 or AU-2 program is
selected
a. Be sure that both Left and Right audio cables are properly
connected to your source. Leaving a cable unconnected will
allow interference to enter the cable
b. If connecting to a Mono source, you should use a ‘Y’ adapter
to send audio to both Left & Right channels of the IMR-4
c. Be sure that audio cable are routed away from vehicle main
wire bundles or other cables carrying large currents.

IMR-4 I/O Interface Module 8
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1095 Mearns Rd. Warminster PA 18974 TEL [phone]
poly-planar
Waterproof Marine Audio
d. In some instances it may be necessary to connect your source
equipment to the vehicle DC ground. Especially for AC
powered devices such as many TVs and VCRs.
19) Signal is too quiet / too loud from external subwoofer or powered
speakers
a. Be sure that you have connected the output of the IMR-4 to
the LINE level input of your woofer or amplifier. If input switch
settings are available then set them to ‘LINE’ or ‘low level
input’
b. In order to achieve proper balance from an externally
connected subwoofer or amplified speaker system you will
need to adjust the gain control on the external device. With
music playing at a moderate level, adjust the gain (volume)
control until the desired sound balance is achieved.
WARRANTY
Poly-Planar marine audio systems are warranted to be free of defects in
materials and workmanship for a period of two years. Warranty is subject to
proper installation and operation within published specifications. Poly-Planar
will repair or replace, at its discretion, any unit returned prepaid to its factory
and determined to be defective. Poly-Planar Inc. is not liable for consequential
damages.