LightSpeed Technologies 820iR User Manual

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Page 1

LightSPEED

820iR

Classroom Amplification System

U s e r M a n u a l

Page 2

SAFETY INSTRUCTIONS

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

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 “dangerous voltage” within the product’s enclosure, that may be sufﬁcient magnitude to constitute a risk of electric shock.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

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.

3.Heed Warning—All warnings on

this LightSPEED product and in

these instructions should be

followed.

8 2 0 i R U s e r M a n u a l 8 2 0 i R U s e r M a n u a l

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.

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.

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.

0. 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. Prevent Electric Shock—do not use

this polarized plug with an extension

cord, receptacle or other outlet

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.

820iR User Manual | i

Page 3

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

A CH B

OFF

DAILY USE INSTRUCTIONS

SPEAKER OUTPUTS

250

400

1K 1K4

2K5

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

SPEAKER OUTPUTS

250

400

1K 1K4

2K5

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

LT-71

TURN ON THE 820iR

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.

TURN ON THE LIGHTMIC

Turn the microphone ON using the

ON/OFF switch on the side of

the LightMic and speak normally.

ii | 820iR User Manual

CHARGE BATTERIES

Plug the LightMic back into the

charging cable to recharge at the

end of the day.

Page 4

TABLE OF CONTENTS

820iR CLASSROOM AMPLIFICATION SYSTEM

8 2 0 i R U s e r M a n u a l8 2 0 i R U s e r M a n u a l

Safety Instructions

Daily Use Instructions

820iR Classroom Ampliﬁcation System

System Components

System Installation

Unpacking Your System

Location of the Receiver/Ampliﬁer

IR Sensor Placement

IR Sensor Installation

Suspended Ceiling Mount

Wall/Solid Ceiling Mount

Speaker Installation

Front Panel Controls

Rear Panel Controls

LightMic Controls and Connections

Initial Setup

Finalizing Receiver/Ampliﬁer

Final Check

System Operation

Turning the System On

Charging the LightMic

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

Page 5

8 2 0 i R U s e r M a n u a l 8 2 0 i R U s e r M a n u a l

LT-71

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

SPEAKER OUTPUTS

250

400

1K 1K4

2K5

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

820iR CLASSROOM AMPLIFICATION SYSTEM

820iR Receiver/Ampliﬁer

SR-70F iR Sensor

LT-71™

(Optional) HM-70 Handheld Microphone

LightMic

Transmitter

Congratulations on your purchase

of the 820iR Classroom Ampliﬁca-

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/

ampliﬁer, LT-71 LightMic™ transmit-

ter, SR-70 infrared sensor and speaker

package.

1 | 820iR User Manual

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.

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.

Page 6

LT-71

SYSTEM COMPONENTS

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

820iR Infrared Receiver/Ampliﬁer

SR-70F Infrared Sensor

Power Supply

8 2 0 i R U s e r M a n u a l8 2 0 i R U s e r M a n u a l

Sensor Cable

LT-71 LightMic™ Transmitter

Speakers and Speaker Wire

Helpful Hint

Optional HM-70 Handheld Microphone

Keep ALL packaging materials. If the system must be returned, it will be quick, convenient and undamaged.

820iR User Manual | 2

Page 7

SYSTEM INSTALLATION

8 2 0 i R U s e r M a n u a l

Unpacking Your System

• Ensure that you have received all of the components of your system.

• 820iR Receiver/Ampliﬁer

and power supply

• 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 middle of the classroom.

• GOOD: High and centered on the long wall.

• AVOID: Locations in corners, on walls at heights lower than 7 feet, or in places where the line of sight is or could be obstructed.

Location of the Receiver/Ampliﬁer

Place the 820iR on a ﬂat surface like a bookcase, countertop or optional LightSPEED wall shelf (part#AC-800WB).

• Select a location that is close to a

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.)

< GOOD

< BEST

Helpful Hint

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.

3 | 820iR Users Manual

Page 8

IR SENSOR INSTALLATION

8 2 0 i R U s e r M a n u a l

Suspended Ceiling Mount

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.

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. Connect the other end of the

sensor cable into one the sensor input on the back of the 820iR.

Wall/Solid Ceiling Mount

wall

mounting

strip

c-clip

sensor jack

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).

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 input on the back of the 820iR.

Speaker Installation

1. Locate the speaker installation

instructions packed with your speaker(s).

2. Follow instructions and mount

speaker(s).

3. Return to this manual to complete

the set up of your system.

Speaker Install

Instructions

820iR User Manual | 4

Page 9

FRONT PANEL CONTROLS

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

8 2 0 i R U s e r M a n u a l

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.

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.

3. AF Indicators (AF): These lights

ﬂash green when audio (voice) from the microphone is detected.

4. A VOLUME: Controls the volume

level of the teacher microphone that is switched to Channel A. Rotating the knob clockwise increases output level.

5. B VOLUME: Controls the volume

level of the optional second microphone that is switched to Channel B. Rotating the knob clockwise increases output level.

6. AUDIO INPUT VOLUME:

• 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.

5 | 820iR User Manual

Page 10

SPEAKER OUTPUTS

250

400

1K 1K4

2K5

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

REAR PANEL CONTROLS

8 2 0 i R U s e r M a n u a l 8 2 0 i R U s e r M a n u a l

1. SPEAKER OUTPUTS (1–4): These

binding post connectors are used to connect the 820iR to the loudspeakers. Depending on speaker, all outputs may not be used.

2. DC POWER: Plug the 24 V power

supply into this jack.

3. CHARGERS: These jacks charge the

LightMic(s) and optional handheld microphone with the supplied charg ing cable(s).

4. AUDIO INPUTS:

• TV/VCR: Accepts stereo signal

from TV/VCR via RCA cable.

• CD/DVD: Accepts stereo signal

from CD/DVD player via RCA cable.

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.

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.

820iR User Manual | 6

Page 11

8 2 0 i R U s e r M a n u a l 8 2 0 i R U s e r M a n u a l

LT-71

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

SPEAKER OUTPUTS

250

400

1K 1K4

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

LIGHTMIC CONTROLS AND CONNECTIONS

1. ON/OFF/MUTE Switch: This switch, located on the side of the LightMic, turns the unit on or off/mute.

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.

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).

7 | 820iR User Manual

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.

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.

Page 12

250

400

1K 1K4

2K5

6K3

-1

AUDIO INPUT

CHARGERS

TV/VCR

CD/DVD

L L

SENSOR INPUT

SENSOR

SHORT

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

INITIAL SET-UP

SPEAKER OUTPUTS

250

400

1K 1K4

2K5

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

SPEAKER OUTPUTS

250

400

700

1K 1K4

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

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.

3. Connect the charging cables to yellow charging jacks labeled “CHARGERS.” The loose end will be input on the microphone

connected to the charger

4. Connect any auxiliary audio sources to corresponding labeled input.

5. Ensure sensor cable is attached securely.

2. Ensure speaker wire connections are secure and

not frayed.

6. Connect DC end of power supply

to the black power jack labeled

“DC POWER.”

7. Connect the black AC power cable

from the power supply to

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

a wall outlet.

charged on a daily basis.

820iR User Manual | 8

Page 13

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

SYSTEM OPERATION

LT-71

250

400

1K 1 K4

-10

SENSOR INPUTS

SENSOR

SHOR

A CH B

OFF

A CH B

OFF

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

SPEAKER OUTPUTS

250

400

1K 1K4

2K5

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

LT-71

TURNING THE SYSTEM ON

1. Turn the 820iR switch to the ON position. The red LED on the switch will glow.

3. Turn on the LightMic and set the operating

channel to “A.” This microphone will be

designated as the “Teacher Mic.”

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

for proper volume adjustment.

4. While speaking in a normal voice,

increase the A VOLUME level until your voice is barely audible. 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, walk around the room and listen for audio dropout and overall audio quality. Fine-tuning the audio is accomplished by making minor adjustments to the 8-Band Graphic Equalizer on the back panel of the

See page 3 for hints on setting the EQ.

6. If a second student pass-around microphone

9 | 820iR User Manual

was purchased with system, repeat steps 3-4 but set the operating channel to “B.” (If a HM-70 was purchased, see page 16.)

receiver/ampliﬁer.

Page 14

CD/DVD

ASSISTIVE LISTENING

ALD VOLUME

CHARGING THE LIGHTMIC

SPEAKER OUTPUTS

250

400

1K 1K4

2K5

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

LT-71

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.)

to obtain a full charge.

8 2 0 i R U s e r M a n u a l 8 2 0 i R U s e r M a n u a l

Helpful Hint

Do not attempt to charge alkaline batteries.

They can overheat and expand, creating a

signiﬁcant hazard and damaging the LightMic.

(This is not covered by the warranty.)

820iR User Manual | 10

Page 15

250

400

1K 1K4

2K5

6K3

-1

AUDIO INPUT

CHARGERS

TV/VCR

CD/DVD

L L

SENSOR INPUT

SENSOR

SHORT

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

SPEAKER OUTPUTS

250

400

1K 1K4

2K5

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

SYSTEM INTEGRATION DIAGRAM

Projector

DVD/VCR

Speaker(s)

IR Sensor

acher’s

Microphone

Projector

Audio Out

IR Transmission

Video In

LT-71

Audio Out

Video Out

POWER

A VOLUME

B VOLUME

TV/VCR CD/DV

ASSISTIVE LISTENIN

IRIRAF

WIRELESS MICROPHONE VOLUM

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

Video Out

SPEAKER OUTPUTS

250

400

700

1K 1K4

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

8 2 0 i R U s e r M a n u a l 8 2 0 i R U s e r M a n u a l

LightSPEED ampliﬁer controls the volume of each source

individually (one volume control for each source).

11 | 820iR User Manual

Page 16

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

INPUT FROM EXTERNAL AUDIO EQUIPMENT

SPEAKER OUTPUTS

250

400

1K 1K4

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

Below are instructions on how to connect an external audio device like a TV/VCR, CD/DVD or computer.

1. Turn the audio input volume controls on the front panel all the

way down (fully counterclockwise).

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. 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.

820iR User Manual |12

Page 17

SPEAKER OUTPUTS

250

400

1K 1K4

2K5

6K3

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPUT

SENSOR

SHORT

2.06/2.54

OUTPUT TO PERSONAL FM TRANSMITTER

POWER

A VOLUME

B VOLUM

TV/VCR CD/DV

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUM

LES 820iR Classroom Amplification System

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

1. Turn the ALD (Assistive Listening Device) volume control on

the front panel all the way down (fully counterclockwise).

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).

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.

13| 820iR User Manual

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.

Page 18

8 2 0 i R U s e r M a n u a l

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

OPERATING THE OPTIONAL HM-70 HANDHELD MIC

MUTE

(Center Position)

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.

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.

OFF

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.

4. Speak directly into the microphone

at a normal level. Slowly increase the B VOLUME until you can just hear your voice.

5. Slide the switch to the OFF position

to turn off the HM-70. (Make sure the power indicator light is off.)

820iR User Manual | 14

Page 19

SPEAKER OUTPUTS

250

400

1K 1K4

2K5

-1

AUDIO INPUT

CHARGERS

POWER

TV/VCR

CD/DVD

L L

24V DC

SENSOR INPU

SENSOR

SHOR

2.06/2.54

8 2 0 i R U s e r M a n u a l

CHARGING THE HM-70 HANDHELD MIC

1. Ensure the HM-70 handheld

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.

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 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.

Helpful

Hint

The charging cable must be plugged directly into the charging jack in the transmitter.

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 will charge in 8 to 12 hours. A fully charged battery will run for up to 8 hours of continuous operation.

4. The HM-70 can remain charging

for up to 10 days. Overcharging will shorten battery life.

15 | 820iR User Manual

Page 20

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.

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.

820iR Users Manual | 16

Page 21

LT-71

POWER

A VOLUME

B VOLUME

TV/VCR

CD/DVD

ASSISTIVE LISTENING

IRIRAF

WIRELESS MICROPHONE VOLUME

AUDIO INPUT VOLUME

ALD VOLUME

LES 820iR Classroom Amplification System

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

• Conﬁrm batteries are charged each night.

• Make sure the LT-71 is turned off while charging so that it a full charge. Full charge will last eight hours

• Make sure the charge cord is connected to the cradle charger.

• 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.

• 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 LT-71 input jack has dam 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.

will attain

, the

age and

No Sound From Speaker

• Turn the 820iR on. Conﬁrm that the POWER light located on the front panel switch is on.

• Conﬁrm signal is being received at the ampliﬁer. The IR signal light will be lit (red) indicating a signal is being received.

• 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.

• Conﬁrm that the speaker wires are connected correctly to the back of the 820iR (refer to speaker install guide).

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.

17 | 820iR User Manual

Page 22

SYSTEM SPECIFICATIONS

OVERALL SPECIFICATIONS

Power Output 12 W per channel (24 W total)

Ampliﬁer Frequency Response 40 Hz to 20 kHz ±3 dB

Carrier Frequencies (IR) 2.06/2.54; 3.2/3.7 MHz

Signal-to-Noise Ratio > 73 dB

Dynamic Range > 73 dB

Maximum Deviation ±50 dB

RECEIVER SPECIFICATIONS

Receiver Type Superheterodyne

Receiver Sensitivity 6 µV for 60 dB S/N

Image and Spurious Rejection > 70 dB

Dimensions (W x D x H) 17.3” x 8.5” x 1.75”

Weight 7 lbs.

TRANSMITTER SPECIFICATIONS

Audio Distortion < 1 %

Built-in Microphone Uni-directional Electret

Battery Power (1-year warranty) 2 AA NiMH Rechargeable

Inputs Mic Level 3.5 mm

Line Level 3.5 mm

Dimensions (W x D x H) 1.375” x .75” x 4.625”

Weight 3.7 oz

IR SENSOR SPECIFICATIONS

Working Range Up to 1600 square feet

per sensor

Cable 50 ft., Plenum-rated

Mounting Ceiling clip/Wall bracket

Dimensions (W x D x H) 4.25” (Diam.) x 2.0” (H)

Weight 4.5 oz

820iR User Manual | 18

Page 23

INDIVIDUAL COMPONENTS & OPTIONAL ACCESSORIES

Part Number

Description

RX-820

LT71

HM70

BA-NH1

AC-TCC7

AC-LTCB

PS-24V-2.5

SR70F

AC-71CC

SPEAKERS

Optional Accessories

MC-TK250LTM

Infrared receiver/ampliﬁer/mixer w/built-in charger

LightMic™ rechargeable microphone/transmitter w/lavaliere cord, batteries and charging cable

Handheld microphone/transmitter w/batteries and charging cable

Rechargeable AA battery (Nickel Metal Hydride)

Charging cable for LT-71 and HM-70 microphones

Lavaliere cord for LT-71

Power supply/battery charger for 820iR

Infrared sensor with cable and wall or ceiling mounting bracket

Cradle charger

Contact LightSPEED at 800.732.8999 for loudspeaker information

Noise-canceling headset microphone used with LT-71

BC-TXLT

AC-800WB

CA-RCA6

CA-RCA24

CA-MMC3535

CA-MMC2535

19 | 820iR User Manual

Wall charger

Wall shelf

6’ dual RCA audio cable

24’ dual RCA audio cable

3.5 mm mono to 3.5 mm mono audio cable

Audio patch cable (2.5 mm mono to 3.5 mm mono)

Page 24

USER NOTES

250

400

1K 1K4

2K5

6K3

-1

SENSOR INPUT

SENSOR

SHORT

8 2 0 i R U s e r M a n u a l8 2 0 i R U s e r M a n u a l

Record your system serial numbers and

purchase information. This is helpful

when ordering additional components,

accessories, and/or warranty service.

Components

820iR

Microphones

Sensors

Speakers

Purchase Information

Your School/Organization

Serial Number

District

Purchase Date

Invoice

820iR User Manual | 20

Page 25

USER NOTES

21 | 820iR User Manual

Page 26

Ligh t S P E E D Tec h n o logi e s , I nc.

1150 9 S W Herma n R d

Tua l a t in, O R 9 7 062

800. 7 3 2 . 8 999

www. l i g h t spee d - t e k .com