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ListenIR Expansion Radiator (For LT-84 only) – LA 141

Listen Technologies

The LA-141 Expansion Radiator (Pat. 9,712,246) from Listen Technologies expands on the functionality and coverage area of the LT-84 Infrared Transmitter/Radiator combo system, giving users and clients an uninterrupted, high-performance listening experience.

Up to four (4) LA-141 Expansion Radiators can be added to the LT-84 system, providing additional coverage up to 2,787 m2 (30,000 ft2) with LR-4200-IR/LR-5200-IR receivers or 697 m2 (7,500 ft2) with LR-42/LR-44 receivers in single-channel mode. A single CAT-5e cable provides both power and signal to the radiators, and the included mounting hardware and single-cable design make installation and setup a breeze.


One (1) LA-141 ListenIR Expansion Radiator
One (1) 25 ft. (7.6 m) CAT-5e Cable
One (1) LA-344 Flexible Mounting Hardware
One (1) Quick Start Guide



ListenIR Expansion Radiator (For LT-84 only) – LA 141

Weight 3.0 lbs
Dimensions 4.1 × 10.7 × 1.5 in

Listen Technologies


System Distortion < 2% (THD) System Specification (wireless end-to-end with LR-44)
System Signal to Noise Ratio (A-Weighted) > 60 dB (SNR) System Specification (wireless end-to-end with LR-44)
System Frequency Response 63 Hz – 15 kHz (+/- 3 dB) System Specification (wireless end-to-end with LR-44)


Indicator Lights On/Off Switch Two (2) position switch – Indicator Lights OFF, Indicator Lights ON
Delay Compensation Four (4) position rotary switch setting (0, 1, 2, 3)


RJ-45 Amber LED Solid Amber indicates carrier is present and IR is being transmitted
RJ-45 Green LED Solid Green indicates power is applied to unit


Carrier Frequencies 2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz
Number of Channels Two (2) channels
Power Save Mode Carrier will shut off when no audio is present for 15 minutes on both channels to preserve radiator life.
Expansion Link Output One (1) RJ-45 connector – Provides RF Signal and Power to one additional LA-141.CAT-5e cable 24 AWG, 100 ft. (30 m) maximum cable length, two (2) LA-141s per daisy chain (total daisy chain cannot extend beyond two expansion radiators)
Expansion Link Input One (1) RJ-45 connector – Receives RF Signal and Power from LT-84


Coverage Area 30,000 ft² (2787 m²) single channel with LR-4200-IR/LR-5200-IR receivers or 7,500 ft² (697 m²) single channel with LR-42/LR-44 receivers
IR Emitter Power 1.49 W


Power Supply 12 VDC, Provided via LT-84 Expansion Link Output RJ-45s
Current Draw 600 mA per LA-141, maximum of two (2) LA-141s daisy chained with CAT-5e cable 24 AWG 100 ft. (30 m) to each LT-84 Expansion Link Output


Color Black with White Silk Screening
Shipping Weight 3.0 lbs. (1.4 kg)
Mounting Can be mounted on a wall, ceiling, or table with provided hardware (screws and hollow wall anchors not provided). Optional LA-347 Wall Box Mounting Plate is available for mounting to a standard single gang electrical box.
Dimensions (H x W x D) 1.5 x 10.7 x 4.1 in. (3.81 x 27.2 x 10.5 cm)
Unit Weight 0.6 lbs. (0.3 kg)


Temperature – Operation 14 °F (-10 °C) to +104 °F (40 °C)
Temperature – Storage -4 °F (-20 °C) to +122 °F (50 °C)
Relative Humidity 0 to 95% relative humidity, non-condensing


Standards FCC Part 15, ICS-03, CE, UL, CUL, C-Tick, CCC, PSE, KC, GS, RoHS, WEEE

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