System Installation
1. Unpacking Your System
• Ensure that you have received all
of the components of your system.
• Locate the speaker installation
instruction sheet that is packaged
with your speakers.
• Keep ALL packaging materials.
If the system must be returned,
it will be quick, convenient
and undamaged.
2. Location
Before installing the system, take
time to consider the placement of
your components.
• Infrared (IR) Sensor: Consider areas
of dark color in the room as they
reflect less infrared light. Sensor
mounting locations should be closer
to dark areas to improve reception.
• Receiver: Place on flat surface close
to standard electrical outlet.
• Speaker(s): Refer to the speaker
installation sheet that is in-
cluded with the speaker(s) for
placement needs.
• Speaker Wire and Sensor Wire:
Plenum wire is included for
each. Ensure the wire length will
cover the area from where you hang
the sensor and speaker(s) to where
you place the receiver. It’s optimal to
route wire overhead (above ceiling
tiles) if possible. In addition, wire
can be routed down the wall and
around the room perimeter secured
with heavy staples or wire raceway.
3. Speaker(s)
• Locate the speaker installation
instructions packed with
your speaker(s).
• Follow instructions and
mount speaker(s).
• Return to the LES 750iR manual to
complete the set up of your system.
4. Receiver/Amplifier
• Place the LES 750iR on a flat surface
like a bookcase or countertop.
• Ensure that the A VOLUME
and B VOLUME knobs are
turned all the way down (fully
counter-clockwise) and the POWER
switch is the OFF position.
• Verify the speaker wire(s) have
been inserted and secured into
the appropriate SPEAKER
OUTPUT connectors (refer to
your speaker instructions for
additional information).
• Plug the power cord into a standard
110 V electrical outlet and attach the
other end into the DC POWER jack
on the back of the LES 750iR.
• Switch the power on the front
panel to the ON position. The red
power indicator on the switch
will light.
Troubleshooting Guide
Please go through this checklist before
calling LightSPEED Service Department.
Battery Check:
• Confirm batteries are charged
each night. With proper charg-
ing, batteries will last about
one school year.
• Transmitters are charged via a
jumper cable from the back of the
LES 750iR. Make sure plugs are
secured and in the proper jacks.
• Confirm the green charging light
located on the front of the LightMic
is on while charging.
• Ensure the LightMic is turned off
while charging.
Hearing Static or Buzzing:
• If using two LightMics, check that
they are not set to the same
channel. If so, select a different
channel for one of the LightMics.
• Keep the LES 750iR at least 6 feet
away from computers.
Low Volume:
• Check volume level on the LES
750iR and adjust as necessary.
• Make sure the LightMic is positioned
properly around the neck (the top of
it should sit just below the collar-
bone). If the microphone is too far
away from the speaker’s mouth, it will
not properly pick up the voice.
Sound Fades In and Out (Drop Out):
• Test LightMic with fully charged
batteries. LED light on front of mic
will glow bright red.
• Make sure there is nothing obstruct-
ing the lens on the LightMic. The
LightMic needs to be worn around
the neck with the lens pointing out
or held in the hand without covering
the lens for proper transmission.
• Make sure there is nothing obstruct-
ing the Infrared sensor. The sensor
should be installed on the ceiling or
high on a wall for proper reception.
No Sound From Speaker:
• Confirm the LightMic and the LES
750iR are turned on and have
matching channels. Check both A
VOLUME and B VOLUME to
ensure they are set correctly.
• Confirm amplifier power
supply is the correct type – if in
doubt, call LightSPEED. In addition,
confirm that the power supply is
connected securely in the wall outlet
and into the DC POWER connector
on the back of the 750iR.
• Turn the 750iR on. Confirm that
the POWER light located on the
front panel switch is on.
• Turn the LightMic on and confirm
that the corresponding red IR light,
located on the front panel of the
750iR, is glowing. When speaking
into the LightMic, the green AF
light will flash/flutter with your
voice volume.
• Confirm that the batteries in the
transmitter are fully charged. When
they are, the red indicator will
glow steadily.
• Confirm that the speaker wires are
connected correctly to the back of
the LES 750iR (refer to speaker install
guide) and make sure that the
speaker switch for that output jack is
in the ON position.
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