Page 1
Using the IW-303 without Volume Control(s)
IW-303
Speaker Switch
Pair A or Pair B
or
Pairs A+B
See Reverse Side for
IMPORTANT Precautionary
and
Installation Information
Figure 1
Figure 2
directions on reverse
IW-303
Using the IW-303 with one (1) Volume Control
for combined control over both speaker pairs
directions on reverse
IW-303
Volume
Control
Using the IW-303 with two (2) Volume Controls
for individual control over each speaker pair
Product available in
White, Ivory & Almond
finishes
Volume controls should be
heavy duty
Autoformer type.
Speakers A
L+ L– R– R+
A
C
L+ L– R– R+
B
L+ L– R– R+
Speakers B
Input
Figure 3
directions on reverse
Volume
Control
IW-303
Volume
Control
Suggestion:
When using two (2)
controls, one (1) for each
pair of speakers, locate the
second volume control in
the same room, or area, as
the second pair of speakers.
Copyright © 1997 OEM Systems Company, Inc., Sparks, Nevada All rights reserved
25
Page 2
IW-303
Important Information
Wiring Directions
Figure 1
Using the IW-303 without volume control(s):
Connect the amplifier left & right speaker outputs to the terminal block on the IW-303 marked "Input" [C].
Connect the left & right wires going to speaker pair "A" to the terminal block on the IW-303 marked "Speakers A".
Repeat for speaker pair "B" connecting to IW-303 terminal block marked "Speakers B".
Figure 2
Using the IW-303 with one (1) volume control:
Connect the amplifier left & right speaker outputs to the terminal block marked "Input" on the OEM Autoformer Volume
Control.
Connect the OEM Autoformer Volume Control terminal block marked "Output" to the IW-303 terminal block marked
"Input" [C].
Connect the left & right wires going to speaker pair "A" to the terminal block on the IW-303 marked "Speakers A".
Repeat for speaker pair "B" connecting to IW-303 terminal block marked "Speakers B".
Figure 3
Using the IW-303 with two (2) volume controls:
Connect the amplifier left & right speaker outputs to the terminal block on the IW-303 marked "Input" [C].
From the terminal block marked "Speakers A", run wires to the Input terminal block on one (1) OEM Autoformer Volume
Control.
From the OEM Autoformer Volume Control terminal block marked "Output", connect the wires going to speaker pair "A".
Repeat for speaker pair "B" connecting to IW-303 terminal block marked "Speakers B".
Wire & Wiring Notes:
A) Wiring to and from switch should be "CL-2 or CL-3" rated. Use 16 gauge or larger for runs in excess of 100 feet.
B) Strip ¼" off each wire. Ensure all strands are twisted together and inserted into respective terminals.
C) For 12 gauge and larger wire, trim some of the strands off to enable them to fit into the terminals.
D) Perform initial testing of selector at low volume level to prevent damage to equipment.
Precautionary Information Concerning Using More Than Two (2) Pairs of Speakers
When speaker pairs A & B are 8 ohms, the summed impedance when both speakers pairs are operating will be 4 ohms.
Because most amplifiers are designed to operate between 4 - 8 ohms you should not configure your system to play any
more than two (2) pair of 8 ohm speakers at a time.
If you wish to wire your system to play more than two (2) pair of 8 ohm speakers simultaneously you need to install an
impedance compensating device. These are manufactured by OEM Systems:
SW-4SPKR
4 pair speaker switcher with impedance compensation
SW-8SPKR
8 pair speaker switcher with impedance compensation
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Copyright © 1997 OEM Systems Company, Inc., Sparks, Nevada, 702 355-0405 All rights reserved
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