INFRARED CLASSROOM AMPLIFICATION SYSTEM USER'S MANUAL 780iR

System Installation
1. Unpacking Your System
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2. Location
 Before installing the system, take time
to consider the placement of your
components.
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3. Speaker(s)
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4. Receiver/Amplifier
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Overall System Specifications:
Carrier Frequencies (IR) 2.06/2.54 MHz
Frequency Stability +
/‒ 3%
Maximum Deviation +/‒ 50 kHz
Dynamic Range > 80 dB
Signal-to-Noise Ratio > 90 dB
Frequency Response 40 Hz - 20 kHz (‒ 3 dB)
Receiver Specifications:
Receiver Type Superheterodyne
Receiver Sensitivity 6
µV for 60 dB S/N ( > 25 dBuV)
Image and Spurious Rejection > 40 dB
Reception Selectivity 40 kHz
Squelching Threshold 3.2
µV
Amplifier Specifications:
Power Output (System Total) 12 W per channel (72 W)
Total Harmonic Distortion < 1% @ 20 W
Speaker Load Impedance 4 Ohms
Power Supply (UL Listed) 24 V/2.5 A
Dimensions 18 x 9 x 3 (H x W x D inches)
Weight 7 lbs.
Inputs:
TV/VCR RCA ‒ Line Level
CD/Tape RCA ‒ Line Level
Computer RCA ‒ Line Level
Auxiliary RCA ‒ Line Level
IR Sensors (6) F Connector
Outputs:
Auxiliary Outputs (2) 3.5 mm
Speaker Outputs (6) 1/4
Transmitter Specifications:
Audio Distortion < 1%
Spurious Emissions < 30 dB
Built-in Microphone Uni-directional Electret
Battery Power (1-year warranty) 2 AA NiMH Rechargeable
Dimensions 1.4 x 1 x 4.6 (W x D x H inches)
Weight 3.04 oz (w/batteries)
External Sensor:
Power By Receiver Unit
Reception Coverage 360
º, Ceiling-mount
Cable 40 ft., Plenum-rated Co-ax
Mounting Ceiling clip/Wall bracket
Diodes 32
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