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POWER
A VOLUME
B VOLUME
TV/VCR
CD/DVD
ASSISTIVE LISTENING
IR
IR
AF
AF
WIRELESS MICROPHONE VOLUME
AUDIO INPUT VOLUME
ALD VOLUME
LES 820iR Classroom Amplification System
9 | 820iR User Manual
820iR User Manual | 10
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
SYSTEM OPERATION
TURNING THE SYSTEM ON
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.
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.
LT-71
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.”
SPEAKER OUTPUTS
250
400
70
0
1K 1K4
2K
5
4K
6K
+1
0
0
-10
OFF
OFF
OFF
OFF
ON
ON
ON
ON
VOL.
ADJ.
ALD OUT
AUX OUT
VOL.
ADJ.
COMPUTER
AUDIO INPUTS
TV/VCR CD/DVD
800i
X
INPU
T
PAGING INPU
T
ADJ
DC POWER CHARGERS
24VDC
L LR R
SENSOR INPUTS
SENSOR
SHOR
T
1 2
3
4
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
receiver/amplifier.
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
>>
>>
>>
>>
>>
>>
A CH B
OFF
ON
See page 3 for hints on setting the EQ.
POWER
A VOLUME
B VOLUME
TV/VCR
CD/DVD
ASSISTIVE LISTENING
IR
IR
AF
AF
WIRELESS MICROPHONE VOLUME
AUDIO INPUT VOLUME
ALD VOLUME
LES 820iR Classroom Amplification System
CHARGING THE LIGHTMIC
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.)
Helpful Hint
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.
SPEAKER OUTPUTS
250
400
70
0
1K 1K4
2K5
4K
6K3
+1
0
0
-1
0
AUDIO INPUT
CHARGERS
DC
POWER
TV/VCR
CD/DVD
L L
R
R
24V
DC
SENSOR INPUT
SENSOR
SHORT
2.06/2.54
LT-71