LightSpeed Technologies Stereo Amplifier 820iR User Manual

LightSPEED  
820iR  
Classroom Amplification System  
U s e r M a n u a l  
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8 2 0 i R U s e r M a n u a l  
SAFETY INSTRUCTIONS  
7.Power Sources—This LightSPEED  
product should be connected to a  
power supply only of the type  
described in these operation  
instructions or as marked on this  
LightSPEED product.  
CAUTION  
RISK OF ELECTRIC SHOCK DO NOT OPEN  
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK  
DO NOT REMOVE COVER (OR BACK)  
NO USER-SERVICEABLE PARTS INSIDE  
8.Power Cord Protection—Power supply  
cords should be routed so that  
they are not likely to be walked upon  
or pinched by items placed upon or  
against them.  
REFER SERVICING TO QUALIFIED PERSONNEL  
The lightning flash with arrowhead symbol  
within an equilateral triangle is intended to alert  
the user to the presence of uninsulated “danger-  
ous voltage” within the product’s enclosure, that  
may be sufficient magnitude to constitute a risk  
of electric shock.  
9.Object and Liquid Entry—Care should  
be taken so that objects do not fall  
onto and liquids are not spilled into  
the inside of this LightSPEED product.  
The exclamation point within an equilateral  
triangle is intended to alert the user to the pres-  
ence of important operating and maintenance  
(servicing) instructions in the literature accom-  
panying the appliance.  
10.Damage Requiring Service—This  
LightSPEED product should be  
serviced only by qualified service  
personnel. The user should not  
attempt to service this LightSPEED  
product.  
1.Read Instructions—All the safety  
and operation instructions should  
be read before this LightSPEED  
product is operated.  
2.Retain Instructions—The safety and  
operating instructions should be  
kept for future reference.  
11.Prevent Electric Shock—do not use  
this polarized plug with an extension  
cord, receptacle or other outlet  
3.Heed Warning—All warnings on  
this LightSPEED product and in  
these instructions should be  
followed.  
unless the blades can be fully  
inserted to prevent blade exposure.  
4.Follow Instructions—All operating  
and other instructions should be  
followed.  
5.Water and Moisture—This Light-  
SPEED product should not be used  
near water.  
6.Heat—This LightSPEED product  
should be situated away from heat  
sources such as radiators, etc.  
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820iR User Manual | i  
8 2 0 i R U s e r M a n u a l  
DAILY USE INSTRUCTIONS  
TURN ON THE 820iR  
LES 820iR Classroom Amplification System  
A VOLUME  
B VOLUME  
TV/VCR  
CD/DVD  
ASSISTIVE LISTENING  
ALD VOLUME  
IR  
AF  
IR  
AF  
POWER  
WIRELESS MICROPHONE VOLUME  
AUDIO INPUT VOLUME  
POSITION THE LIGHTMIC  
Unplug the LightMic from the  
charging cable and place it around  
your neck. Adjust the neck strap so  
the top of the microphone rests just  
below your collarbone.  
LT-71  
AUDIO INPUT  
250  
TV/VCR  
CD/DVD  
2.06/2.54  
DC  
L
L
SPEAKER OUTPUTS  
CHARGERS  
POWER  
24V  
DC  
R
R
LT-71  
TURN ON THE LIGHTMIC  
Turn the microphone ON using the  
ON/OFF switch on the side of  
CHARGE BATTERIES  
Plug the LightMic back into the  
charging cable to recharge at the  
end of the day.  
the LightMic and speak normally.  
LT-71  
AUDI  
TV/VCR  
2.06/2.54  
DC  
SPEAKER OUTPUTS  
CHARGERS  
POWER  
24V  
DC  
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ii | 820iR User Manual  
8 2 0 i R U s e r M a n u a l  
TABLE OF CONTENTS  
820iR CLASSROOM AMPLIFICATION SYSTEM  
Safety Instructions  
i
Daily Use Instructions  
ii  
1
820iR Classroom Amplification System  
System Components  
2
System Installation  
3
Unpacking Your System  
Location of the Receiver/Amplifier  
IR Sensor Placement  
3
3
3
IR Sensor Installation  
4
Suspended Ceiling Mount  
Wall/Solid Ceiling Mount  
Speaker Installation  
4
4
4
5
Front Panel Controls  
Rear Panel Controls  
6
LightMic Controls and Connections  
Initial Setup  
7
8
8
Finalizing Receiver/Amplifier  
Final Check  
8
System Operation  
9
9
Turning the System On  
Charging the LightMic  
10  
11  
12  
13  
14  
15  
16  
16  
17  
18  
19  
20  
21  
System Installation Diagram  
Input from External Audio Equipment  
Output to Personal FM Transmitter  
Operating the Optional HM-70 Handheld Mic  
Charging the HM-70  
Tips on Classroom Amplification  
Warranty Statement  
Troubleshooting Guide  
System Specifications  
Individual Components and Optional Accessories  
User Notes  
User Notes  
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8 2 0 i R U s e r M a n u a l  
820iR CLASSROOM AMPLIFICATION SYSTEM  
820iR Receiver/Amplifier  
LES 820iR Classroom Amplification System  
A VOLUME  
B VOLUME  
TV/VCR  
CD/DVD  
ASSISTIVE LISTENING  
IR  
AF  
IR  
AF  
POWER  
WIRELESS MICROPHONE VOLUME  
AUDIO INPUT VOLUME  
ALD VOLUME  
6K3  
AUDIO INPUT  
SENSOR INPUT  
250  
400  
700  
1K  
1K4  
2K5  
4K  
TV/VCR  
CD/DVD  
+10  
2.06/2.54  
DC  
L
L
0
SPEAKER OUTPUTS  
CHARGERS  
POWER  
24V  
SENSOR  
SHORT  
DC  
-10  
R
R
LT-71  
SR-70F  
iR Sensor  
LT-71™  
LightMic  
Transmitter  
(Optional) HM-70  
Handheld Microphone  
Congratulations on your purchase  
of the 820iR Classroom Amplifica-  
The 820iR is a two-channel receiver  
amplifier that allows the use of up  
to two microphones simultaneously  
and up to two additional audio input  
sources (such as TV, VCR, DVD, CD,  
MP3, etc.). In addition, LightSPEED  
offers various speaker options that  
are included with your system to pro-  
vide optimal sound in rooms of  
all shapes and sizes.  
tion System! This simple, yet power-  
ful technology provides crystal-clear  
sound throughout the classroom,  
allowing every child to hear every  
word every time.  
As the teacher speaks into the  
LightMic pendant-style transmitter,  
his or her voice is transmitted to the  
820iR and then amplified through the  
loudspeaker(s). The standard system  
includes the 820iR infrared receiver/  
The LT-71 LightMic is a wireless, pen-  
dant-style transmitter. This two-chan-  
nel, rechargeable unit is clipped to a  
lavaliere cord and worn around the  
neck for teacher use, or it can be used  
like a standard handheld microphone  
for the students to pass around when  
speaking.  
amplifier, LT-71 LightMic transmit-  
ter, SR-70 infrared sensor and speaker  
package.  
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1 | 820iR User Manual  
8 2 0 i R U s e r M a n u a l  
SYSTEM INSTALLATION  
Location of the Receiver/Amplifier  
Unpacking Your System  
Place the 820iR on a flat surface like a  
bookcase, countertop or optional Light-  
SPEED wall shelf (part#AC-800WB).  
• Ensure that you have received  
all of the components of  
your system.  
• Select a location that is close to a  
• 820iR Receiver/Amplifier  
and power supply  
standard wall electrical outlet.  
Wires will be routed back to the  
amplifier, so select a location that is  
free from obstructions that may make  
routing wire difficult. (Example: under  
a whiteboard or bulletin board.)  
LT-71 LightMic Transmitter  
• SR-70F Infrared Sensor  
and cable  
• Speaker(s) and speaker wire  
IR Sensor Placement  
Sensor location is very important for  
optimum performance of the 820iR  
Classroom Amplification System.  
• BEST: On the ceiling at or near the  
< BEST  
< GOOD  
middle of the classroom.  
• GOOD: High and centered on the  
long wall.  
orners, on  
han 7 feet,  
line of sight is  
nt  
Fine-tuning the Graphic Equalizer:  
1. Verify that the EQ is set to match the recommended setting for the specific  
speakers installed in the classroom (settings included with the speaker install guide).  
2. Walk around room (near speakers) and listen for squealing or feedback.  
3. Lower the 2K5 and/or 4K sliders if a high-pitched squealing is present.  
4. Lower the 400 or 700 sliders if a low-pitched ring is present.  
5. Reduce volume if feedback is still present.  
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3 | 820iR Users Manual  
8 2 0 i R U s e r M a n u a l  
IR SENSOR INSTALLATION  
Suspended Ceiling Mount  
Wall/Solid Ceiling Mount  
wall  
mounting  
strip  
c-clip  
sensor jack  
1. Lift the ceiling tile nearest the  
grid rail in your desired sensor  
location. Guide one side of the  
C-clip over one edge of the grid  
rail. Providing firm support to the  
back of the grid rail with one hand  
(to prevent bending), firmly and  
carefully snap the second side of  
the C-clip over the edge of the rail.  
1. Screw the plastic mounting  
strip to a place high on the  
wall or in the middle of the solid  
ceiling. Mount the strip horizon-  
tally as shown above.  
2. Firmly snap the C-clip on the back  
of the IR sensor onto the plastic  
mounting strip with the sensor  
plug hanging down (if a wall  
mount) or toward the receiver  
location (if ceiling mount).  
2. Uncoil sensor wire. Connect one  
end of the sensor cable to the plug  
on the sensor. Loosely secure wire  
overhead and route it back to the  
820iR.  
3. Uncoil the sensor wire. Screw one  
end of the sensor cable to the  
plug on the sensor. Route the  
wire back to the 820iR,  
securing it along the way.  
4. Connect the other end of the  
sensor cable to the sensor  
3. Connect the other end of the  
sensor cable into one the sensor  
input on the back of the 820iR.  
input on the back of the 820iR.  
Speaker Installation  
1. Locate the speaker installation  
instructions packed with your  
speaker(s).  
Speaker Install  
Instructions  
2. Follow instructions and mount  
speaker(s).  
3. Return to this manual to complete  
the set up of your system.  
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820iR User Manual | 4  
8 2 0 i R U s e r M a n u a l  
FRONT PANEL CONTROLS  
LES 820iR Classroom Amplification System  
6
2
A VOLUME  
B VOLUME  
TV/VCR  
CD/DVD  
ASSISTIVE ISTENING  
1
7
5
IR  
AF  
IR  
AF  
POWER  
4
WMICROPHONE VOLUME  
ALD VOLUME  
AUDIO INPUT VOLUME  
3
4. A VOLUME: Controls the volume  
level of the teacher microphone  
that is switched to Channel A.  
Rotating the knob clockwise  
increases output level.  
1. POWER Switch/POWER Indicator:  
This switch is used to turn the  
820iR ON (switch up), or OFF  
(switch down). When the POWER  
switch is in the ON position, the  
red POWER light will glow.  
5. B VOLUME: Controls the volume  
level of the optional second  
2. IR Indicators (IR): These lights will  
glow red when the corresponding  
microphone is turned on. This light  
confirms the 820iR is receiving the  
infrared signal.  
microphone that is switched to  
Channel B. Rotating the knob  
clockwise increases output level.  
6. AUDIO INPUT VOLUME:  
3. AF Indicators (AF): These lights  
flash green when audio (voice)  
from the microphone is detected.  
• TV/VCR: Controls the volume of  
a TV/VCR connected to the  
TV/VCR INPUT.  
• CD/DVD: Controls the volume  
of a CD/DVD player connected  
to the CD/DVD INPUT.  
7. ASSISTIVE LISTENING VOLUME:  
Controls the volume level of an  
assistive listening device.  
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5 | 820iR User Manual  
8 2 0 i R U s e r M a n u a l  
REAR PANEL CONTROLS  
4
1
6K3  
AUDIO INPUT  
SENSOR INPUT  
5
50  
400  
700  
1K  
1K4  
2K5  
4K  
TV/VCR  
CD/DVD  
+10  
2.06/2.54  
DC  
6
L
L
0
SPEAKER OUTPUTS  
CHARGERS  
POWER  
24V  
SENSOR  
SHORT  
DC  
-10  
R
R
7
2
3
4. AUDIO INPUTS:  
1.SPEAKER OUTPUTS (1–4): These  
binding post connectors are used to  
• TV/VCR: Accepts stereo signal  
connect the 820iR to the loudspeakers.  
Depending on speaker, all outputs  
may not be used.  
from TV/VCR via RCA cable.  
• CD/DVD: Accepts stereo signal  
from CD/DVD player via RCA cable.  
2. DC POWER: Plug the 24 V power  
5. 8-BAND GRAPHIC EQUALIZER: The  
sliding controls adjust the levels of  
the various audio frequencies. This  
allows the installer to properly  
equalize the system to produce  
optimum sound quality.  
supply into this jack.  
3. CHARGERS: These jacks charge the  
LightMic(s) and optional handheld  
microphone with the supplied charg-  
ing cable(s).  
6. SENSOR INPUT: The IR sensor  
cable connects to the sensor input.  
Connect additional sensors to the  
820iR to cover large or odd-  
shaped classrooms.  
7. SENSOR SHORT: This LED glows  
when there is a short in one of the  
sensor cables.  
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820iR User Manual | 6  
8 2 0 i R U s e r M a n u a l  
LIGHTMIC CONTROLS AND CONNECTIONS  
4
1
LT-71  
2
LT-71  
5
6
3
1.ON/OFF/MUTE Switch: This switch,  
located on the side of the LightMic,  
turns the unit on or off/mute.  
5.Auxiliary (AUX): Plug a laptop, MP3  
player or other audio source into  
this jack to wirelessly transmit the  
audio signal to be played through  
the 820iR.  
2.Channel Select Switch (CH A/B):  
This switch allows for selection  
between Channel A or B. If you are  
using a single microphone/transmit-  
ter for your system, we recommend  
using Channel A.  
6.Charger Input (CHARGER): Plug  
the charging cable from the 820iR  
into this jack for daily charging.  
The LED on the front will glow red  
to indicate charging.  
3.Power/Charge LED Indicator: The  
light glows blue when the LightMic  
is powered ON, red when plugged  
into the charging cable.  
4.External Microphone Input (MIC):  
Use the 3.5 mm MIC jack for the  
optional TK-250 headset microphone  
(part# MC-TK250LTM).  
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7 | 820iR User Manual  
8 2 0 i R U s e r M a n u a l  
INITIAL SET-UP  
FINALIZING RECEIVER/AMPLIFIER CONNECTIONS  
1. Ensure the power switch is in the “OFF” position  
and all front panel volume controls are turned  
fully counter-clockwise.  
2. Ensure speaker wire  
connections are secure  
andnot frayed.  
LES 820iR Classroom Amplification System  
A VOLUME  
B VOLUME  
TV/VCR  
CD/DVD  
ASSISTIVE LISTENING  
ALD VOLUME  
IR  
AF  
IR  
AF  
POWER  
WIRELESS MICROPHONE VOLUME  
AUDIO INPUT VOLUME  
3. Connect the charging cables to yellow charging jacks labeled  
“CHARGERS.” The loose end will be connected to the charger  
input on the microphone.  
6K3  
AUDIO INPUT  
SENSOR INPUT  
250  
400  
700  
1K  
1K4  
2K5  
4K  
TV/VCR  
CD/DVD  
+10  
2.06/2.54  
DC  
L
L
0
SPEAKER OUTPUTS  
CHARGERS  
POWER  
24V  
SENSOR  
SHORT  
DC  
-10  
R
R
6K  
AUDIO INPUT  
250  
400  
700  
1K  
1K4  
2K5  
4K  
4. Connect any auxiliary audio  
TV/VCR CD/DVD  
+10  
54  
L
L
0
sources to corresponding  
CHARGERS  
-10  
R
labeled input.  
>>  
5. Ensure sensor cable is attached  
securely.  
6. Connect DC end of power supply  
to the black power jack labeled  
“DC POWER.”  
6K3  
AUDIO INPUT  
SENSOR IN  
250  
400  
700  
1K  
1K4  
2K5  
4K  
TV/VCR  
CD/DVD  
+10  
06/2.54  
DC  
OWER  
V
L
L
0
CHARGERS  
SENSOR  
SHORT  
-10  
R
R
7. Connect the black AC power cable  
from the power supply to a wall outlet.  
>>  
FINAL CHECK  
1. Ensure all cables are appropriately routed out of walking paths and work areas to  
prevent safety hazards to individuals in the room.  
2. The amplifier packing material should be kept for warranty shipping purposes.  
Dispose of remaining system-packing material in the appropriate refuse containers.  
Leave microphones charging so they are ready for use. Microphones will need to be  
charged on a daily basis.  
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820iR User Manual | 8  
8 2 0 i R U s e r M a n u a l  
SYSTEM OPERATION  
TURNING THE SYSTEM ON  
1. Turn the 820iR switch to the ON  
LES 820iR Classroom Amplification System  
position. The red LED on the switch  
A VOLUME  
B VOLUME  
TV/V  
AU  
will glow.  
>>  
IR  
AF  
IR  
AF  
POWER  
WIRELESS MICROPHONE VOLUME  
2. Slip the LT-71 LightMic with lanyard  
around the neck and position the top of  
the microphone just below the collarbone.  
Note: Positioning of the LightMic is critical  
LT-71  
> >  
for proper volume adjustment.  
3. Turn on the LightMic and set the operating  
A CH  
B
channel to A.” This microphone will be  
OFF  
ON  
designated as the “Teacher Mic.”  
>>  
4. While speaking in a normal voice,  
LES 820iR Classroom Amplification System  
>>  
A VOLUME  
B VOLUME  
TV/VCR  
CD/DVD  
increase the A VOLUME level until  
your voice is barely audible.  
IR  
AF  
IR  
AF  
POWER  
WIRELESS MICROPHONE VOLUME  
AUDIO I
Remember! This equipment is  
designed to supplement and distribute  
the end user’s voice so they are able to speak at a conversational tone.  
Having the volume set too high will result in feedback and listener fatigue.  
> >  
5. Once initial volume level is set,  
6K  
250 400 700  
2K5  
1K 1K4  
+10  
4K  
walk around the room and listen fo
audio dropout and overall audio  
quality. Fine-tuning the audio is  
accomplished by making minor  
adjustments to the 8-Band Graphi
Equalizer on the back panel of the  
receiver/amplifier.  
0
-10  
See page 3 for hints on setting the EQ.  
6. If a second student pass-around microphone  
was purchased with system, repeat steps  
3-4 but set the operating channel to “B.”  
(If a HM-70 was purchased, see page 16.)  
A CH  
B
OFF  
ON  
>>  
9 | 820iR UseDroMwnalonaudafrlom Www.Somanuals.com. All Manuals Search And Download.  
8 2 0 i R U s e r M a n u a l  
CHARGING THE LIGHTMIC  
1. Ensure that the LightMic is turned OFF.  
2. Connect one end of the charging cable to the  
LightMic and the other end to one of the charger  
jacks on the back of the 820iR. The LED on the  
front of the LightMic will glow when fully charged.  
3. Leave the LightMic plugged in overnight (8–10 hrs.)  
LT-71  
to obtain a full charge.  
AUDIO INPUT  
250  
400  
700  
1K  
1
TV/VCR  
CD/DVD  
+10  
2.06/2.54  
DC  
L
L
0
SPEAKER OUTPUTS  
CHARGERS  
POWER  
24V  
DC  
-10  
R
R
l Hint  
to charge alkaline batteries.  
eat and expand, creating a  
rd and damaging the LightMic.  
ered by the warranty.)  
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8 2 0 i R U s e r M a n u a l  
SYSTEM INTEGRATION DIAGRAM  
Video In  
r  
Projector  
IR Sensor  
IR Transmission  
Teacher’s  
Microphone  
LT-71  
Speaker(s)  
Audio Out  
Video Out  
Audio Out  
LES 820iR Classroom Amplification System  
VOLUME  
DVD/VCR  
A
B
VOLUME  
TV/VCR  
CD/DVD  
ASSISTIVE LISTENING  
ALD VOLUME  
Video Out  
IR  
AF  
IR  
AF  
POWER  
WIRELESS MICROPHONE VOLUME  
AUDIO INPUT VOLUME  
LightSPEED amplifier controls the volume of each source  
individually (one volume control for each source).  
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11 | 820iR User Manual  
8 2 0 i R U s e r M a n u a l  
INPUT FROM EXTERNAL AUDIO EQUIPMENT  
Below are instructions on how to connect an external audio device  
like a TV/VCR, CD/DVD or computer.  
LiR Classroom Amplification System  
1
A VOLUME  
B VOLUME  
TV/VCR  
CD/DVD  
ASSISTIVE LISTENING  
ALD VOLUME  
IR  
AF  
IR  
AF  
POWER  
WIRELESS MICROPHONE VOLUME  
AUDIO INPUT VOLUME  
1. Turn the audio input volume controls on the front panel all the  
way down (fully counterclockwise).  
6K3  
AUDIO INPUT  
SENSOR INPUT  
250  
400  
700  
1K  
1K4  
2K5  
4K  
TV/VCR  
CD/DVD  
+10  
54  
L
L
0
CHARGERS  
R  
SENSOR  
SHORT  
-10  
R
2
2. Connect a patch cable (not included)  
from the audio source in the corre-  
sponding audio input jacks on the  
back of the 820iR.  
3
820iR Classroom Amplification System  
A VOLUME  
B VOLUME  
TV/VCR  
CD/DVD  
ASSISTIVE LISTENING  
ALD VOLUME  
IR  
AF  
IR  
AF  
POWER  
WIRELESS MICROPHONE VOLUME  
AUDIO INPUT VOLUME  
3. With both the 820iR and audio source power on, adjust the  
corresponding volume control on the front panel until the  
desired level is achieved. NOTE! Be careful to not overdrive the  
volume to the loudspeaker(s), as this can cause potential damage.  
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820iR User Manual |12  
8 2 0 i R U s e r M a n u a l  
OUTPUT TO PERSONAL FM TRANSMITTER  
1. Turn the ALD (Assistive Listening Device) volume control on  
the front panel all the way down (fully counterclockwise).  
LES 820iR Classroom Amplification System  
A VOLUME  
B VOLUME  
TV/VCR  
CD/DVD  
ASSISTIVE LISTENING  
ALD VOLUME  
IR  
AF  
IR  
AF  
POWER  
WIRELESS MICROPHONE VOLUME  
AUDIO INPUT VOLUME  
2. Determine the size and type of audio input  
jack on the device as many manufacturers’  
products differ in connector size and  
shape. The LightSPEED LES-370 Personal  
FM System requires a 3.5 mm to 3.5 mm  
patch cable (part# CA-MMC3535, not included).  
LES 820iR Classroom Amplification System  
A VOLUME  
B VOLUME  
TV/VCR  
CD/DVD  
ASSISTIVE LISTENING  
UME  
IR  
AF  
IR  
AF  
POWER  
WIRELESS MICHONE VOLUME  
AUDIO INPUT VOLUME  
3. Connect a patch cable from the ALD’s  
microphone jack or AUX input to the 3.5  
mm ASSISTIVE LISTENING” jack on the  
front of the 820iR.  
4. Adjust the volume control on the ALD’s receiver to maximum  
output. NOTE! This is to set the maximum allowable signal  
from the 820iR.  
5. With the 820iR and ALD turned on, speak into the LightMic and slowly  
adjust the corresponding ALD VOLUME” control until the appropriate  
audio level is attained in the ALD’s receiver headphones.  
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13| 820iR User Manual  
8 2 0 i R U s e r M a n u a l  
OPERATING THE OPTIONAL HM-70 HANDHELD MIC  
LES 820iR Classroom Amplification System  
A VOLUME  
B VOLUME  
TV/VCR  
CD/DVD  
ASSISTIVE LISTENING  
ALD VOLUME  
IR  
AF  
IR  
AF  
POWER  
WIRELESS MICROPHONE VOLUME  
AUDIO INPUT VOLUME  
ON  
OFF  
MUTE  
(Center Position)  
3. Grip the barrel of the HM-70 in the  
center section just below the power  
switch. Avoid gripping the HM-70  
around the bottom, covering the  
infrared emitters circling the base.  
This could interrupt signal trans-  
mission from the microphone to  
the receiver.  
The Channel A/B switch is located  
inside the battery compartment.  
The switch is set to Channel B at  
the factory.  
1.Slide the power switch on the side  
of the HM-70 all the way up. The  
power indicator LED will glow red  
and stay on.  
4. Speak directly into the microphone  
at a normal level. Slowly increase  
the B VOLUME until you can just  
hear your voice.  
2.The center position of the power  
switch is MUTE. When in this mode,  
the HM-70 is transmitting a signal,  
but no audio can be heard through  
the system. This is useful if you  
wish to temporarily turn audio off  
during a private conversation.  
5. Slide the switch to the OFF position  
to turn off the HM-70. (Make sure the  
power indicator light is off.)  
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820iR User Manual | 14  
8 2 0 i R U s e r M a n u a l  
CHARGING THE HM-70 HANDHELD MIC  
AUDIO INPUT  
TV/VCR  
250  
400  
700  
1K  
1K4  
CD/DVD  
+10  
2.06/2.54  
DC  
L
L
0
ER OUTPUTS  
CHARGERS  
POWER  
24V  
DC  
-10  
R
R
1. Ensure the HM-70 handheld  
3. The power indicator light next to  
the power switch glows green when  
the cable is connected and charg-  
ing correctly. The light goes out  
when fully charged. Batteries  
microphone is turned OFF (ON/OFF  
switch on the side of the unit).  
The 820iR can be left on, but must  
be connected to AC power in order  
to charge the microphone.  
will charge in 8 to 12 hours. A fully  
charged battery will run for up to 8  
hours of continuous operation.  
2. Connect the loose end of the  
charging cable into the jack labeled  
CHARGER on the side of the HM-70.  
Connect the larger end of the  
4. The HM-70 can remain charging  
for up to 10 days. Overcharging  
will shorten battery life.  
charging cable to one of the  
CHARGERS jacks on the back of the  
820iR. The HM-70’s rechargeable  
batteries are factory installed.  
The HM-70 does not use a cradle for charging.  
The charging cable must be plugged directly  
into the charging jack in the transmitter.  
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8 2 0 i R U s e r M a n u a l  
TIPS ON CLASSROOM AMPLIFICATION  
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.  
1
2
3
4
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.  
Recharge batteries each night. When recharged nightly, operating  
time (actual usage) for the transmitters will last through a typical  
school day.  
Five-year Limited Warranty  
LightSPEED Classroom Amplification Systems are guaranteed against malfunction due to  
defects in materials and workmanship for a period of FIVE (5) YEARS, beginning at the date  
of the purchase invoice. If such malfunction occurs, the product will be repaired or replaced  
(at LightSPEED’s option) without charge during the period and under the limitations stipulated  
in the data sheet or the user’s manual.  
1. Limited exclusions specifically apply to all microphone elements, rechargeable  
batteries, battery chargers and their assemblies, as well as external cables and wires.  
2. Warranty on microphones/microphone elements is limited to original manufacturer’s  
warranty (usually ONE (1) YEAR).  
3. Warranty on LightSPEED NiMH AA rechargeable batteries is ONE (1) YEAR.  
3. Warranty on LightMic’s internal microphone is FIVE (5) YEARS.  
4. Prepaid shipping label provided by LightSPEED factory or an authorized warranty  
service center.  
5. Warranty does not extend to finish, appearance items, or malfunctions due to abuse or  
operation other than specified conditions, nor does it extend to incidental or consequential  
damages. Repair by other than LightSPEED or its authorized service agencies will void this  
guarantee. Information on authorized service agencies is available from LightSPEED  
Technologies, Inc.  
Our Service Department (800.732.8999, 6:30 a.m. – 5 p.m.,  
PST) will handle all your repair/replacement needs.  
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820iR Users Manual | 16  
8 2 0 i R U s e r M a n u a l  
TROUBLESHOOTING GUIDE  
Note: Most problems are directly related to low battery power. Please  
run through the “Battery Check” items first. For remaining trouble-  
shooting, use known good, fully-charged batteries.  
Battery Check  
No Sound From Speaker  
• Confirm batteries are charged  
each night.  
Turn the 820iR on. Confirm that  
the POWER light located on the  
front panel switch is on.  
• Make sure the LT-71 is turned off  
while charging so that it will attain  
a full charge. Full charge will last  
eight hours.  
• Confirm signal is being received  
at the amplifier. The IR signal  
light will be lit (red) indicating a  
signal is being received.  
• Make sure the charge cord is  
connected to the cradle charger.  
• Confirm microphone is function-  
ing. Next to the IR signal light is  
the AF signal light. This light will  
flicker (green) as audio is picked  
up by the microphone indicating  
activity.  
• Inspect the battery contacts. Clean  
and adjust if necessary.  
Hearing Static  
• Ensure sensor is in optimum  
location (refer to sensor placement  
in manual). A single sensor will  
cover a 1600 sq. ft. enclosed  
classroom.  
• Confirm that the speaker wires  
are connected correctly to the  
back of the 820iR (refer to  
speaker install guide).  
• Ensure that no other LT-71/HM70 is  
operating on the same channel.  
• If an external microphone is in use,  
try another LightMic that is known  
to be working (if available) to isolate  
the problem. If static persists with  
“known good” microphone, the  
LT-71 input jack has damage and  
will need service.  
Low Volume or Feedback  
Ensure microphone is positioned  
appropriately, just below the collar-  
bone. If a headset microphone is in  
use, the end of the mic boom  
should be positioned at the corner  
of the mouth.  
• Check volume level on the ampli-  
fier. If the volume is too high, feed-  
back WILL occur. Adjust accordingly.  
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, 6:30 a.m. – 5 p.m. PST.  
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17 | 820iR User Manual  
8 2 0 i R U s e r M a n u a l  
SYSTEM SPECIFICATIONS  
OVERALL SPECIFICATIONS  
Power Output  
12 W per channel (24 W total)  
40 Hz to 20 kHz ±3 dB  
2.06/2.54; 3.2/3.7 MHz  
> 73 dB  
Amplifier Frequency Response  
Carrier Frequencies (IR)  
Signal-to-Noise Ratio  
Dynamic Range  
> 73 dB  
Maximum Deviation  
±50 dB  
RECEIVER SPECIFICATIONS  
Receiver Type  
Superheterodyne  
6 µV for 60 dB S/N  
> 70 dB  
Receiver Sensitivity  
Image and Spurious Rejection  
Dimensions (W x D x H)  
Weight  
17.3” x 8.5” x 1.75”  
7 lbs.  
TRANSMITTER SPECIFICATIONS  
Audio Distortion  
< 1 %  
Built-in Microphone  
Battery Power (1-year warranty)  
Inputs  
Uni-directional Electret  
2 AA NiMH Rechargeable  
Mic Level 3.5 mm  
Line Level 3.5 mm  
1.375” x .75” x 4.625”  
3.7 oz  
Dimensions (W x D x H)  
Weight  
IR SENSOR SPECIFICATIONS  
Working Range  
Up to 1600 square feet  
per sensor  
Cable  
50 ft., Plenum-rated  
Ceiling clip/Wall bracket  
4.25” (Diam.) x 2.0” (H)  
4.5 oz  
Mounting  
Dimensions (W x D x H)  
Weight  
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820iR User Manual | 18  
8 2 0 i R U s e r M a n u a l  
INDIVIDUAL COMPONENTS & OPTIONAL ACCESSORIES  
Part Number  
Description  
RX-820  
Infrared receiver/amplifier/mixer w/built-in charger  
LightMicrechargeable microphone/transmitter  
w/lavaliere cord, batteries and charging cable  
LT71  
Handheld microphone/transmitter w/batteries and  
charging cable  
HM70  
Rechargeable AA battery (Nickel Metal Hydride)  
Charging cable for LT-71 and HM-70 microphones  
Lavaliere cord for LT-71  
BA-NH1  
AC-TCC7  
AC-LTCB  
PS-24V-2.5  
SR70F  
Power supply/battery charger for 820iR  
Infrared sensor with cable and wall or ceiling mounting  
bracket  
Cradle charger  
AC-71CC  
Contact LightSPEED at 800.732.8999 for loudspeaker  
information  
SPEAKERS  
Optional Accessories  
Noise-canceling headset microphone used  
with LT-71  
MC-TK250LTM  
BC-TXLT  
Wall charger  
Wall shelf  
AC-800WB  
CA-RCA6  
6’ dual RCA audio cable  
24’ dual RCA audio cable  
CA-RCA24  
3.5 mm mono to 3.5 mm mono audio cable  
Audio patch cable (2.5 mm mono to 3.5 mm mono)  
CA-MMC3535  
CA-MMC2535  
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19 | 820iR User Manual  
8 2 0 i R U s e r M a n u a l  
USER NOTES  
Record your system serial numbers and  
purchase information. This is helpful  
when ordering additional components,  
accessories, and/or warranty service.  
Components  
Serial Number  
820iR  
Microphones  
Sensors  
Speakers  
Purchase Information  
Your School/Organization  
District  
Purchase Date  
Invoice  
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820iR User Manual | 20  
8 2 0 i R U s e r M a n u a l  
USER NOTES  
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21 | 820iR User Manual  
LightSPEED Technologies, Inc.  
11509 SW Herman Rd  
Tualatin, OR 97062  
800.732.8999  
www.lightspeed-tek.com  
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