705iR PORTABLE INFRARED WIRELESS
AMPLIFICATION SYSTEM
U S E R ’ S M A N U A L
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Quick-start Guide:
Simply follow the six steps on this page
to get your 705iR up and running in a
matter of minutes!
To take full advantage of the features the
705iR has to offer, as well as its applica-
tions, please take time to read through
the entire manual.
1Plug battery charger/power supply
into 705iR.
2Plug one end of power cable into battery charger/power
supply and the other end into AC outlet.
3
To turn 705iR on, rotate CH A POWER knob clockwise.
Switch LT-70 LightMic™ Transmitter to the ON position
4
(confirm LT-70 is set to CH A.)
Clip LT-70 to black lavaliere cord. Loop cord around neck.
5
Adjust cord length until the top of the LT-70 rests
on the collarbone.
Turn CH A POWER knob to adjust volume to desired level.
6
[1]
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Greetings!
705iR Components
Congratulations on your purchase of the
705iR Portable Infrared Wireless
Listed on this page are the standard
components that are included in the
705iR Portable Infrared Wireless
Amplification System:
Amplification System! Please take a
moment to review this manual, as it will
help you operate this easy-to-use system,
and maximize your investment by caring
for and maintaining each component.
Pay careful attention to the instructions
on batteries and battery charging to ex-
tend the operational life of the batteries.
LT-70 LightMic™ Transmitter
705iR Receiver/Amplifier
Battery Charger/Power Supply
Microphone Charging Cable
[2]
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Overview
Top Panel Controls
e 705iR is a lightweight, multipurpose,
portable amplification system powered by
rechargeable batteries or AC power. It is
designed to allow teachers to speak in nor-
mal conversational tones and yet be heard
clearly by every student in the classroom.
1. CH A POWER: is knob turns on
the power for the 705iR and controls
the Channel A volume. We recom-
mend using Channel A if you are
using a single microphone for your
system. Turn the knob clockwise to
increase volume.
e 705iR comes standard with the LT-70
LightMic™ pendant-style transmitter/
microphone. e system may be used with
two microphones accommodating team
teaching or student interaction. e second
microphone can be an additional LightMic
or the HM-70 handheld microphone.
Other optional microphones can also be
plugged into the LightMic. Contact
LightSPEED for assistance in selecting
optional microphones.
2. CH B VOLUME: is knob controls
the volume for Channel B. You must
first turn the 705iR ON with the
CH A POWER knob, then turn the
CH B VOLUME knob clockwise to
increase volume. Use Channel B
when using a second microphone.
3. TREBLE: is knob controls the
high-frequency sound of the 705iR.
Ch. A and Ch. B
LEDs are hidden by
their corresponding
volume knobs in this
diagram.
7
Aux. In
Jack
10
Ch. B
8
LED
Aux. Out
Jack
9
Ch. A
LED
POWER
1
3
5
2
6
4
[3]
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Top Panel Controls (cont.)
Rear Panel Connections
4. BASS: is knob controls the low-
frequency sound of the 705iR.
5. AUX IN VOLUME: is knob
controls the volume level of an external
audio source that is plugged into the
AUX IN jack. An example would be a
computer, TV, VCR, CD or
2
cassette player.
External
IR Sensor
Jack
6. AUX OUT VOLUME: is knob
controls the audio level going to
external equipment when plugged into
the AUX OUT jack. For example, a
personal FM transmitter or tape
recorder.
Carry
Handle
4
Charging
LED
7. AUX INPUT JACK: is 3.5 mm
jack is used to connect to an external
audio source.
1
3
1
Transmitter
Charging
Jacks
DC
Power
Input Jack
8. AUX OUTPUT JACK: is 3.5
mm jack provides a line-level audio
output that can be connected to a
personal FM system or tape recorder.
1. DC POWER INPUT JACK:
is input connects to the 16 V
AC/DC adaptor that comes with
the 705iR. e adaptor is used to
either charge the internal battery
pack or power the 705iR with
AC power.
Power and Signal Indicators
9. e LED light located above the
CH A POWER knob turns red
momentarily when the system power
is turned ON.
2. EXTERNAL IR SENSOR JACK:
When a transmitter/microphone
set to Channel A is turned on, the
Channel A LED glows green to
indicate your transmitter’s signal is
being received by the amplifier.
is jack is provided for connection
of an additional sensor (for larger or
odd-shaped rooms).
3. TRANSMITTER CHARGING
JACKS: is connector is used to
connect the charging cable to the
LightMic transmitter or the optional
HM-70 handheld microphone for
daily battery recharging.
10. e LED above CH B VOLUME
turns green to indicate a signal is
being received from a transmitter
set to Channel B.
4. CHARGING LED: is LED glows
red when the 705iR battery is charging
and glows green when fully charged.
[4]
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™
LT-70 LightMic Transmitter
Controls and Connections
Microphone
External
Microphone
Connector
Clip
On/Off
4
1
Switch
3
Power/
Charge
LED
Channel
Select
2
5
[A-B]
Charging
Connector
1. ON/OFF SWITCH: is switch,
located on the side of the LightMic,
turns the unit on or off. e red
triangle-shaped LED on the front
of the LightMic will light when
power is on.
4. EXTERNAL MICROPHONE
CONNECTOR: Use the 3.5 mm
MIC jack for the optional TK-250
headset microphone.
5. CHARGER CONNECTOR: Use
the jack labeled CHARGER to
connect the charging cable from the
705iR to the LightMic for daily
battery recharging.
2. CHANNEL SELECT SWITCH:
is switch allows for selection
between Channel A or B. If you
are using a single microphone/
transmitter for your system, we
recommend using Channel A.
3. POWER/CHARGE LED
INDICATOR: is triangle-shaped
LED is two-color. It glows red when
the LightMic is powered on, green
when charging and goes out when
fully charged.
[5]
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705iR Receiver/Amplifier
[ Positioning ]
When Using Battery Power:
If the 705iR will be moved within a
classroom or to different class-
rooms, battery-powered will provide
the most flexibility.
e 705iR has a built-in speaker, which
should be directed toward the area of the
classroom where the students are sitting. e
unit can be placed on a table top or book-
shelf at a height of 36 to 60 inches.
Charging the 705iR
e ideal position in the classroom is cen-
tered along the longest wall. However, due to
different classroom setups, this is not always
possible. Here is a quick guide to choosing
a location:
a. Ensure the power switch (CH A POWER)
on top of the 705iR is turned off.
b. Plug the power supply/charger cable into
a standard AC outlet.
Best: Centered on the longest wall
Good: Centered on the short wall
Okay: In a corner
c. Plug the other end of the power supply/
charger into the DC power jack on
the back of 705iR. e LED above
the DC will glow red. A solid green LED
indicates the 705iR is fully charged.
Avoid: Placing the unit directly in front of
a window.
d. Charge the batteries completely prior to
first use. Charging time can take as
long as 10 to 14 hours. When fully
charged, the circuit switches to a trickle
charge, which will not overcharge or
damage the batteries.
[ Two Power Options: AC or Battery ]
e 705iR operates with battery power in
a portable application, or you can leave the
system connected to AC power for a more
permanent application.
[ battery charger and AC connection ]
When using AC power:
If the 705iR will primarily be
used in a fixed location within
the classroom, LightSPEED
recommends using AC power.
LED
DC Power
Input Jack
a. Plug the power supply into a standard
AC outlet.
AC Power
Cord
b. Plug the other end of the power supply/
charger into the DC power jack.
c. Turn the CH A POWER on and set
an appropriate volume level. e 705iR
may be left on at all times when using
AC power.
[6]
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™
LT-70 LightMic
Transmitter/Microphone
e rechargeable NiMH
batteries must be fully charged
before regular classroom
operations.
Green
LED
Power to Amplifier
Charging the LightMic
a. Ensure the LightMic and the 705iR
are turned OFF. e 705iR must be
connected to AC power in order to
charge the LightMic.
However, do not leave the LightMic plugged
into the charger for more than 10 days, as it
will significantly shorten battery life.
f. Once the batteries are charged,
remove the charging cable from
the LightMic.
b. e LightMic’s rechargeable batteries
are factory installed. Plug one end of
the charging cable firmly into the jack
labeled CHARGER on the side of the
LightMic. Connect the other end of the
charging cable to the charging jack on
the back of the 705iR.
g. NiMH batteries will maintain their
charge for a full day of normal
classroom use.
h. With proper care, NiMH batteries
will provide service for at least one
year. If battery or charging problems
occur, contact LightSPEED Service at
800.732.8999.
c. e triangle-shaped light on the
front of the LightMic transmitter
glows green when the cable is
connected and charging correctly.
e light goes out when fully charged.
d. e batteries will fully charge in
about 8 to 12 hours.
[ caution! ]
Do not attempt to charge alkaline
batteries̶they can overheat and
expand, creating a significant hazard
e. It is best to leave the LightMic
charging until used, since the
batteries slowly lose their charge
when not in use.
and damaging the LightMic.
(is is not covered by the warranty.)
[7]
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Operating the LightMic
a. e LightMic has a built-in microphone.
Once the transmitter is switched on, the
microphone is activated.
d. Speak at a normal level and slowly
turn the volume knob clockwise to
increase the loudness of the speaker
until the sound level is adequate for
the room.
b. e LightMic may be used as a hand-
held mic or a hands-free pendent style
microphone by clipping the LightMic
on the supplied lavaliere cord.
[note:]
Feeedback or “squealing” may occur if the
volume is set too high. Reducing the loudness
of the speakers with the volume control
usually eliminates feedback.
Place the lavaliere cord around your neck,
and adjust the length so the top of the
LightMic rests on the collar bone.
Operating two transmitter/
microphones simultaneously
c. On the side of the LightMic is the Chan-
nel A/B slide switch. Slide the switch to
the “A” position. (If a second LightMic
is used for simultaneous operation, set
one LightMic to Channel A and the
second LightMic to Channel B.)
e 705iR system has two independent
receivers—Channel A and B. is makes
it possible to operate two transmitter/mi-
crophones simultaneously. Follow the
instructions below when using a second
transmitter/microphone:
d. Slide the ON/OFF switch on the side of
the LightMic to ON. e triangle-
shaped light on the front glows red,
indicating the microphone is charged
and ready for use.
a. Set each transmitter/microphone to
separate channels. For example if
you are using two LightMics, set one
to Channel A and the other to
Channel B. If you are using one
LightMic and one HM-70 handheld
microphone, set the LightMic to
Channel A and the HM-70 to
Channel B.
e. When the LightMic transmitter power
switch is slid to OFF, the microphone
power is turned off.
Adjusting Volume
Volume is set by adjusting the volume control
on the 705iR.
When the 705iR is receiving a signal from the
transmitter microphone(s):
a. Make sure the 705iR is switched ON.
• CH A POWER indicator will glow
green on the 705iR if you select
Channel “A” on the LightMic
transmitter.
b. Ensure the LightMic is switched ON and
the triangle-shaped LED on the front of
the LightMic is glowing red. e LED
next to the CH A knob on the 705iR
will also glow, indicating that the 705iR
is receiving the LightMic signal and is
ready for use.
• CH B VOLUME indicator light
will glow green if Channel “B”
is selected.
c. Adjust the volume of the receiver by
turning CH A POWER clockwise. Be
careful not to stand directly in front of
the speaker as feedback may occur.
• When simultaneously operating two
transmitters/microphones, both
indicator lights will glow.
[8]
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Optional HM-70 Handheld
Microphone
Optional HM-70 Handheld
Microphone Controls
e HM-70 handheld microphone is
an optional microphone that can be
ordered from LightSPEED. It can be
used alone or in tandem with the
LT-70 LightMic.
1. POWER SWITCH: is 3-position
switch allows you to turn the micro-
phone on (up position), mute the
microphone (middle position), and
turn off the microphone (down posi-
tion). e red LED above the switch
lights when the switch is in the
Power/Charge LED
“MUTE” or power “ON” positions.
3
2. CHANNEL SELECT SWITCH:
is switch allows you to choose
between Channel A or Channel B.
is switch is set to Channel B at
the factory.
3. POWER/CHARGE LED
Power Switch
1
INDICATOR: is two-color LED
indicator is located directly above the
power switch. It glows red when the
HM-70 is powered on and glows green
when charging.
slide to open
4
Battery
Charging Jack
Compartment
4. CHARGING JACK: Use the jack
labeled CHARGER to connect the
charging cable from the 705iR to the
HM-70 for daily battery recharging.
Chanel Select Switch
2
Gain Adjust
top view of battery compartment
[ caution! ]
Do not attempt to charge alkaline
batteries̶they can overheat and
expand, creating a significant hazard
and damaging the LightMic.
(is is not covered by the warranty.)
[9]
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Optional HM-70 Handheld
Microphone Operating
Instructions
Holding and Positioning
a. When holding the HM-70, grip the
barrel in the center, silver section
Charging
below the ON/OFF switch. Do NOT
grip the HM-70 around the bottom,
covering the black infrared sensors
encircling the base. is interrupts
signal transmission from the microphone
to the receiver. Speak directly into the
top of the microphone at a normal level,
holding the head about 2 inches from
your mouth, no lower than chin height.
Rechargeable batteries are pre-installed.
a. Turn off the HM-70 by sliding the
ON/OFF switch all the way down
and turn off the 705iR.
b. Connect one end of the charging cable
to one of the CHARGE jacks on the
back panel of the 705iR. Connect the
other end of the charging cable to the
charging jack on the side of the HM-70.
e power indicator LED will glow
green when the charging cable is
Input From External
Audio Equipment
Below are instructions on how to connect
an external audio device like a computer,
CD player, cassette player, VCR and TV to
the 705iR.
connected and charging correctly.
c. e batteries fully charge in 8 to 12
hours. Once the batteries are charged,
remove the charger cable from the
HM-70.
1. Connect a cable from an audio source
to the 3.5 mm AUX IN jack next to
the AUX IN volume knob on the top
of the 705iR.
NiMH batteries maintain their charge for
a full day of normal classroom use. Always
turn the HM-70 off when not in use.
2. With the 705iR turned on, adjust the
AUX IN volume to a desired level.
Operation
Output to Personal
FM Transmitter
e Channel A/B switch is located inside
the battery compartment. e switch is set to
Channel B at the factory.
1. Using a cable with a 3.5 mm connec-
tor at one end, connect the AUX
OUT of the 705iR to the input jack
of the FM transmitter. Different
manufacturers use different size
audio input jacks on the transmitter.
e LightSPEED LES-370 requires a
the CA-MMC 3535 cable.
a. Slide the ON/OFF switch on the side of
the HM-70 all the way up. e power
indicator LED will glow red and stay on.
(ere is a center MUTE position if you
wish to leave power on but temporarily
cease transmission of your voice.)
b. Do not adjust the audio gain adjuster
that is located in the battery compart-
ment. It has been preset by factory
technicians and is not intended as a
volume control.
2. With the 705iR turned on, adjust the
AUX OUT volume to a desired level.
[10]
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Tips on Using Classroom
Amplification
ese helpful suggestions are provided
to maximize the successful use of your
new 705iR Portable Infrared Wireless
Amplification System.
• Do not use or attempt to recharge
disposable alkaline batteries—they will
overheat and expand, creating a signifi-
cant hazard and damaging the transmit-
ter. (is type of damage is not covered
under warranty.)
• Speak in a natural voice. A normal
conversational speech level will provide
an adequate signal. It is not necessary to
increase the intensity of your voice—the
amplification system provides adequate
amplification (approximately 5 - 10 dB)
above ambient room noises.
• Connecting the 705iR into a standard
electrical socket using the supplied 16 V
DC power supply/charger charges the
batteries. It can also be used as a direct
power source for the amplifier.
• Avoid wearing jewelry that may rub or
bump against the microphone.
• Turn the LightMic OFF during private
conversations with a student, parent, or
other classroom visitor. You can also
cover the LED lens on top of the
LightMic to block the signal.
If you review these instructions and still
have questions, write down the serial
number and model number of your system
and call LightSPEED Technical Services at
800.732.8999, 7 a.m. - 5 p.m. PST.
• Recharge batteries each night. When
recharged nightly, operating time
(actual usage) for the transmitters will
last through a typical school day. Your
rechargeable batteries will last for a
normal school year when cared
for properly.
[11]
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Overall System Specifications:
Carrier Frequencies (IR)
Maximum Deviation
Dynamic Range
Signal-to-Noise Ratio
Total Harmonic Distortion
Frequency Response
2.06/2.54 MHz
+/‒ 50 kHz
> 70 dB
> 70 dB
< 4 %
100 Hz - 10 kHz
Receiver/Amplifier Specifications:
Receiver Type
Receiver Sensitivity
Image and Spurious Rejection
Superheterodyne
6 µV for 60 dB S/N
> 70 dB
Amplifier Specifications:
Total Harmonic Distortion
Power Output
< 1 % (Output = 1 W)
12 W RMS
Standard Cone (4 inches)
4 Ohms
+/‒ 8 dB (100 Hz - 10 kHz)
16 V/2.0 A
12 V NiMH Battery Pack
13.25 x 5.75 x 4 (H x W x D inches)
5 lbs. w/battery pack
Speaker Type
Speaker Load Impedance
Adjustable Tone Controls
Power Supply (UL Listed)
Battery Power (1-year warranty)
Dimensions
Weight
Transmitter Specifications:
Audio Distortion
Spurious Emissions
Built-in Microphone
Battery Power (1-year warranty)
Dimensions
< 1%
< 30 dB
Uni-directional Electret
2 AA NiMH Rechargeable
1.4 x 1 x 4.6 (W x D x H inches)
3.04 oz. (w/batteries)
Weight
[12]
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Individual Components and Optional Accessories
LES-LT70:
“LightMic” Rechargeable Microphone/Transmitter
with lavaliere cord, batteries and charging cable
LES-HM70:
Handheld Microphone/Transmitter with batteries
and charging cable
BA-NH1:
Rechargeable AA Battery (Nickel Metal Hydride)
AC-TCC7:
Charging Cable for LT-70 and HM-70 to be used
with 705iR
AC-LTCB:
Lavaliere cord for LT-70
PS-16V-2.0:
AC-SP705:
MC-TK250LTM:
Power Supply/Battery Charger for 705iR
Carrying Case for 705iR
Optional Noise-canceling Headset Microphone to
be used with LT-70
IR-SR70:
Optional External Infrared Sensor to expand the
range for large or odd-shaped rooms.
CA-MMC35:
Audio Input Cable (RCA connector to 3.5 mm mono)
Audio Patch Cable (3.5 mm mono to 3.5 mm mono)
CA-MMC3535:
CA-MMC2535:
Audio Patch Cable (2.5 mm mono to 3.5 mm mono)
[13]
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Five-Year Limited Warranty to Original Purchaser
e LightSPEED 705iR Portable Infrared Wireless
Amplification System is warranteed against
malfunction due to defects in materials and
workmanship for a period of five years beginning at
the date of the purchase. Batteries and the optional
TK-250 Headset Microphone are guaranteed for
one year. Products will be repaired or replaced at
LightSPEED’s option during the warranty period.
Warranty does not extend to finish, appearance, or
malfunctions due to abuse or misuse. Repairs
performed by any other than LightSPEED will void
this warranty. Our Service Department
(800.732.8999, 7 a.m. – 5 p.m., PST) will handle
all your repair/replacement needs.
[14]
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User Notes
Record your system serial numbers and
purchase information. is is helpful
when ordering additional components,
accessories, and/or warranty service.
standard
serial number
serial number
components
705iR
LT-70 LightMic
Power Supply
optional
components
HM-70 Handheld
Microphone
TK-250 Headset
Microphone
SR-70 IR Sensor
[15]
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L I G H T S P E E D T E C H N O L O G I E S , I N C .
1 1 5 0 9 S W H E R M A N R D
T U A L A T I N , O R 9 7 0 6 2
8 0 0 . 7 3 2 . 8 9 9 9
W W W . L I G H T S P E E D - T E K . C O M
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