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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 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.
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
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
SYSTEM SPECIFICATIONS
OVERALL SPECIFICATIONS
RECEIVER SPECIFICATIONS
TRANSMITTER SPECIFICATIONS
IR SENSOR SPECIFICATIONS
1 | 820iR User Manual
820iR User Manual | 18
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
820iR Receiver/Amplifier
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.
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.
820iR CLASSROOM AMPLIFICATION SYSTEM
SR-70F
iR Sensor
(Optional) HM-70
Handheld Microphone
LT-71
LT-71™
LightMic
Transmitter
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
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