Page 1
INSTALLATION MANUAL
TECHNOLOGY
LM-l AND LM-2
INSTALLATION AND SPECIFICATIONS:
SPECIFICATIONS
Power: Transformers rated at 100 Watts RMS continuous (300 Watts audio)
35Hz-20kHz.
Connections: Large gold binding posts-front,
Screw tight type, non removable-rear (accepts up to 10 gauge wire).
Mounting: Fits most double gang junction boxes.
INSTALLATION
The LM-I and LM-2 are high quality units that allow you to operate multiple sets of
speakers from a single source without impedance load problems. These units employ two tri-filar
wound transformers with an impedance selector switch. This provides a choice of desired
impedance to the amplifier while maintaining a flat frequency response for optimum sound
reproduction.
The LM-2 allows connection of the amplifier and one pair of speakers to the front of the
plate, and four additional pairs of speakers to the rear. The Load Master I has front connectors for
the amplifier only, with four pairs of speakers on the rear.
Follow the wiring diagram on the back of this sheet for your unit. The impedance multiplier
switch should be set as follows: using 5 or more pairs of 8 Ohm speakers the switch should be set
at 8X, using 3 or more pairs of 4/6 Ohm speakers the switch should be set at 8X, and using
combinations of 4 and 8 Ohm speakers the switch should be set at 8X. Other wise the switch
should be set at 4X.
WARRANTY
Your AUDIOPLEX TECHNOLOGY LM-I and 2 is covered by a LIFETIME warranty against
any defects in workmanship and materials. Any defects will be remedied without charge for labor
or parts.
Damage incurred by shipping or by accident is not considered to be a defect, and not
covered by this warranty. AUDIOPLEX TECHNOLOGY, is not responsible for defective operation
caused by abuse or by modification or by service by any unauthorized person or agency.
The unit must be properly installed and operated according to instructions for the
warranty to apply. Any necessary servicing must be done by AUDIOPLEX TECHNOLOGY. The unit
must be returned expenses prepaid, with written authorization from the company. The unit must
be shipped with the proof of purchase and in the original carton and packing material to avoid
damage.
This warranty gives you specific legal rights. You may have other rights which vary from
state to state.
1999 - 4/22/99
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WIRING DIAGRAM FOR LM-2
FRONT SPEAKERS
L- L+
COMMON GROUND
FRONT VIEW
L+ L- R- R+
TECHNOLOGY
R+ R-
REAR VIEW
COMMON GROUND
L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+
TM
L+ L- R- R+ L+ L- R- R+
L+ L- R- R+ L+ L- R- R+
8x
4x
IMPEDANCE
MULTIPLIER
SWITCH
WIRING DIAGRAM FOR LM-l
FRONT VIEW
L+ L- R- R+
TECHNOLOGY
REAR VIEW
L+ L- R- R+ L+ L- R- R+ L+ L- R- R+
L+ L- R- R+
TM
L+ L- R- R+
L+ L- R- R+
L+ L- R- R+ L+ L- R- R+
IMPEDANCE
8x
MULTIPLIER
4x
1999 - 4/22/99
SWITCH
404 GWH P.O. BOX 440 MELVIN VILLAGE, N.H. 03850
1-800-257-2077 603-544-8601 FAX: 603-544-8901
AUDIOPLEX TECHNOLOGY
Page 3
SPECIFICATIONS
Connectors: Small binding posts.
Power Handling: Transformers rated at 100 Watts RMS continuous (300 Watts audio)
35Hz-20kHz.
Wire: 16 to 14 Gauge recommended.
WIRING
The LM-3 is a high quality unit that allows you to operate four sets of speakers (up to six 8 Ohm
speaker pairs by doubling up on two locations) from a single amplifier without impedance problems. It can
accomplish this with amplifiers whose A & B outputs are wired in parallel or series. (See diagram for
graphical explanation of parallel and series.) It is the only unit in the world that can effectively accomplish
this task.
The wiring diagram for the front of the unit, gives you two options for connecting your multi-room
speaker system. Option A: Indicates the proper connections, when using a single stereo amplifier with
speaker A and B outputs. Option B: Indicates the proper connections when using separate amplifiers.
To connect the speaker wires to your LM-3, first unscrew the binding post to reveal the wire hole on
the connector. Strip the insulation off the wire end and insert into the wire hole (the binding posts are spaced
to accept banana jacks if desired). Be sure to follow the wiring diagram exactly to avoid amplifier damage,
paying particular attention to the polarity (+ and -) of all connections.
NOTE: During use, the front of the unit can become warm. This is normal. Also be aware that the main living
room speakers may be slightly louder than the other multi-room speakers in the system, depending on your
set up.
WARNING! If your amplifier is a series output type and with both A and B speaker sets engaged, a volume
control effects all the speakers, you must determine if the A and B outouts are wired in series or in parallel.
To test your amplifier, connect a single speaker to the A left channel output, and a single speaker to the B left
channel output. Turn on the amplifier and select a source. Activate both A & B outputs. With the music
playing at a moderate level, disconnect any of the four wires from the back of the amplifier. If the music goes
out completely, your amplifier outputs are wired in series. If one speaker continues to play, the amplifier
outputs are wired in parallel. Next follow these steps:
1.) Make sure that the wiring is correct.
2.) If the wiring is correct, the problem may be with your particular brand of amplifier. Some models
(i.e. Sony ) use the B speaker + as the first output, when in series mode. To correct the situation,
wire the speaker A outputs to the B input on the plate, and the B outputs to the A input on the plate.
WARRANTY
Your AUDIOPLEX TECHNOLOGY LM-3 is covered by a Lifetime Warranty against any defects in
workmanship and materials. Any defects will be remedied without charge for labor or parts.
Damage incurred by shipping or by accident is not considered to be a defect, and not covered by this
warranty. AUDIOPLEX TECHNOLOGY, is not responsible for defective operation caused by abuse or by
modification or service by any unauthorized person or agency.
The unit must be properly installed and operated according to instructions for the warranty to apply.
Any necessary servicing must be done by AUDIOPLEX TECHNOLOGY. The unit must be returned expenses
prepaid, with written authorization from the company. The unit must be shipped with the proof of purchase
and in the original carton and packing material to avoid damage.
This warranty gives you specific legal rights. You may have other rights which vary from state to state.
COPYRIGHT 98
PATENT PENDING
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FRONT WIRING DIAGRAM FOR LM-3
WIRING OPTION A
L+ L-
R+R- L- L+
SPEAKER A OUT
SPEAKER B OUT
R+R- L- L+
R- R+
LIVING ROOM
SPEAKERS
A-IN
B-IN
WIRING OPTION B
L+ L-
A-OUT
LIVING ROOM
SPEAKERS
R+ R-
R+R- L- L+
LIVING ROOM AMPLIFIER
MULTI-ROOM AMPLIFIER
R+R- L- L+
A-IN
A-OUT
B-IN
COPYRIGHT 98
PATENT PENDING
Page 5
REAR WIRING DIAGRAM FOR LM-3
L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+
L+ L- R- R+ L+ L- R- R+
L+ L- R- R+ L+ L- R- R+
AUDIOPLEX TECHNOLOGY
404 GWH P.O. BOX 440 MELVIN VILLAGE, N.H. 03850
1-800-257-2077 603-544-8601 FAX: 603-544-8901
www.audioplex.com
COPYRIGHT 98
PATENT PENDING
Page 6
INSTALLATION MANUAL
TECHNOLOGY
LM-3
INSTALLATION AND SPECIFICATIONS
USAGE
The LM-3 is designed to overcome problems encountered when using both the A and B outputs on a receiver
at the same time. Using both outputs at the same time can create the following problems depending on whether your
receiver has the outputs wired in series or in parallel.
SERIES
FRONT SPEAKERS
A+
A+
TYPICAL PARALLEL SYSTEM
FRONT SPEAKERS
TYPICAL SERIES SYSTEM
A-
connected inside receiver
A-
connected inside receiver
B+
B+
PARALLEL
A+
REMOTE SPEAKERS
VOLUME
CONTROL
volume control is now
in series and will
control both outputs
8 OHM FRONT SPEAKERS
Front speakers play
much louder than
A-
B-
B-
remote speakers.
A+
B+
REMOTE SPEAKERS
A-
B-
B+
IMPEDANCE
MATCHING
SYSTEM
VOLUME
CONTROL
B-
32 Ohm load with
Autoformer style Volume
Control turned down.
4X less Impedance on front
REMOTE SPEAKERS
path of least
resistance
COPYRIGHT 98
PATENT PENDING
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