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SYSTEM INSTALLATION
Unpacking Your System
Location of the Receiver/Amplifier
IR Sensor Placement
Place the 850iR on a flat surface like a
bookcase, countertop or optional Light-
SPEED 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.)
Sensor location is very important for
optimum performance of the 850iR
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.
< BEST
• Ensure that you have received
all of the components of
your system.
• 850iR Receiver/Amplifier
and power supply
• LT-71 LightMic
™
Transmitter
• SR-70F Infrared Sensor
and cable
• Charging Cradle and cable(s)
• Speaker(s) and speaker wire
< GOOD
3 | 850iR Users Manual
850iR Users Manual | 20
8 5 0 i R U s e r M a n u a l
8 5 0 i R U s e r M a n u a l
Helpful Hint
Power Output 12 W per channel (48 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
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.