Listen Technologies LT-84
ListenIR Combination Transmitter / Radiator

OUR PART #:  LT-84

The Listen Technologies LT-84 ListenIR Transmitter-Radiator is the only product of its kind that provides complete coverage in a wide variety of venue spaces.
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Our Price: $555.30
List Price: $617.00
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Listen Technologies LT-84
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The Listen Technologies LT-84 ListenIR Transmitter-Radiator is the only product of its kind that provides complete coverage in a wide variety of venue spaces. This advanced IR product is simple to use, cost-effective, designed to blend in to any environment, and offers twice the amount of IR power of similar products, and up to six times the coverage area.

A single unit provides up to 30,000 sq ft (2787 sq m) coverage area with LR-4200-IR/LR-5200-IR receivers or 7,500 sq ft (697 sq m) with LR-42/LR-44 receivers in single channel mode, ensuring that the entire room has coverage without gaps or null spots.

The LT-84 is the first IR system with Expansion Radiators (LA-141) that implement delay compensation—no signal cancellation drop outs. Plus, it is the only two channel Transmitter-Radiator with up to four frequencies; 2.3 MHz, 2.8 MHz, 3.3 MHz, or 3.8 MHz, providing flexibility in the field and eliminating the need to purchase a specific frequency based transmitter-radiator.

In addition four (4) Expansion Radiators (LA-141) can be added for additional coverage, when mounted within 100 ft. (30.48 m) cable length from the LT-84.  A single CAT-5e cable carries both power and signal to the LA-141 Expansion Radiators making it a true one-cable connection. 

Easy installation includes mounting hardware for wall, ceiling, or table mounting and a multi-lingual legislative compliance sign. Flexible frequency selection and input connectivity minimizes on-site installation hassles.

Listen Technologies LT-84 Includes:

  • One (1) LT-84 ListenIR Transmitter/Radiator Combo
  • One (1) LA-210 12 VDC Universal Power Supply/Power Cord
  • One (1) LA-344 Flexible Mounting Hardware
  • Two (2) Phoenix Type Connectors
  • One (1) LA-303 Multi-Lingual Assistive Listening Notification Sign
  • One (1) Quick Start Guide

Listen Technologies LT-84 Features:

  • The best, most cost-effective solution for secureassistive listening in smaller spaces such as; classrooms, courtrooms, corporate meeting rooms, and theaters
  • The only product of its kind that provides complete, gap-less coverage in small-to-medium spaces
  • This advanced IR product is simple to use, cost-effective, designed to blend in to any environment, and offers more coverage than similar products
  • One (1) LT-84 with a LR-42 or LR-44 ListenIR receiver covers up to 30,000 sq ft (2787 sq m) with LR-4200-IR/LR-5200-IR receivers or 7,500 sq ft (697 sq m) with LR-42/LR-44 receivers with more than twice the IR power with 1.49 watts of any product of its kind
  • Add up to (4) four expansion radiators (LA-141) for additional coverage, when mounted within 100 ft. (30.48 m) cable length from the LT-84
  • Flexible frequency selection of 2.3, 2.8, 3.3, 3.8 MHz in a single unit
  • True one-cable connection via single CAT-5e cable which carries both power and signal to the LA-141 expansion radiators
  • Flexible input connectivity of Mic, RCA stereo sum, and Phoenix line level summed on each input channel simplifies installation

Listen Technologies LT-84 Specifications:

  • Audio:
    • Frequency Response:  20 Hz - 20 kHz (+/- 1 dB) Line Input 63 Hz - 15 kHz (±3dB) System Specification (wireless end-to-end with LR-44)
    • Signal-to-Noise Ratio:  >70dB (SNR) Line Input >60dB (SNR) System Specification (wireless end-to-end with LR-44)
    • Total Harmonic Distortion:  <0.1% (THD) Line Input <2% (THD) System Specification (wireless end-to-end with LR-44)
    • Balanced Line Input:  Mono Input. Two (2) Phoenix Type connector, balanced, +4dBu nominal input, +14dB headroom, impedance 100 kOhms
    • Microphone Input:  Two (2) 1/8" (3.5 mm) Tip/Sleeve connector, -30dBu nominal input, +14dB headroom, impedance 4.4 kOhms, 5 VDC bias supply
    • Unbalanced Line Input:  Stereo/Mono Input. Two (2) Dual (RCA) Phono connectors, unbalanced, -10dBu nominal input, +14dB headroom, impedance 10 kOhms
  • Controls:
    • Power Switch:  Three (3) position switch - Power OFF, Power ON-Indicator Lights OFF, Power ON-Indicator Lights ON
    • Level Control Knob:  Two (2) audio taper rotary potentiometer, counter-clockwise decreases input mix level, clockwise increases input mix level
    • Carrier Frequency Selection:  Two (2), four (4) position rotary switches (2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz)
  • Indicators:
    • Power Supply LED:  Green LED on in-line power supply indicates AC power is applied
    • Audio Level Indicators:  Two (2) Green LEDs, two (2) Red LEDs, Green LED indicates Audio presence and Red LED indicates peaks in the audio
    • 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, flashing indicates unit has entered power save mode
  • RF:
    • Number of Channels:  Two (2) channels, Selectable carrier frequency
    • Frequency Accuracy:  ±0.005% stability 0 to 50 °C
    • Transmitter Stability:  50 PPM
    • Expansion Link Output:  Two (2) RJ-45 connectors - Provides RF Signal and Power, CAT-5e cable 24 AWG, 100 ft. maximum cable length, two (2) LA-141s per output connector
    • Modulation:  FM Wideband, ±50kHz deviation max, 50 µS pre-emphasis
    • Carrier Frequencies:  2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz, Selectable
    • Power Save Mode:  Carrier will shut off when no audio is present for 15 minutes on both channels to preserve radiator life
  • IR:
    • IR Emitter Power:  1.49 W
    • Coverage Area:  30,000 sq ft (2787 sq m) single channel with LR-4200-IR/LR-5200-IR receivers or 7,500 sq ft (697 sq m) single channel with LR-42/LR-44 receivers
  • Power:
    • Power Supply Output:  12 VDC, 4 A, 48 W
    • Power Supply Connector:  2.5 mm ID barrel connector, center positive
    • Power Output:  Two (2) RJ-45 connectors. providing Power and RF signal for up to two (2) LA-141 expansion radiators on each output
    • Power Supply Type:  In-line switching mode power supply, Listen part number LA-210
    • Power Supply Input:  100-240 VAC, 50-60 Hz
    • Power Supply Line Cord:  IEC line cord, North America Type B (LT-84-01), Asia and UK Type G (LT-84-02), Euro Type C (LT-84-03), Australia Type I (LT-84-04)
  • Physical:
    • Dimensions (HxWxD):  1.5" x 10.7" x 4.1" (3.81 cm x 27.2 cm x 10.5 cm)
    • Color:  Black with White Silk Screening
    • Unit Weight with Power Supply:  1.8 lbs. (0.8 kg)
  • Environmental:
    • 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
  • Compliance:
    • Power Supply Compliance Marks:  CUL, UL, CE, CCC, C-Tick, KC, PSE, GS, FCC, RoHS
    • Standards:  FCC part 15, ICS-03, CE, UL, CUL, C-Tick, CCC, PSE, KC, GS, RoHS, WEEE
Listen Technologies LA-141  ListenIR Expansion Radiator for LT-84 Transmitter
Listen Technologies LA-141 ListenIR Expansion Radiator for LT-84 Transmitter
The Listen Technologies LA-141 ListenIR Expansion Radiator is part of the most advanced, lowest cost IR solution available. The LA-141 can be added to the LT-84 ListenIR Transmitter/Radiator Combo for additional coverage of up to 30,000 sq ...
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Listen Technologies LA-344  Omnidirectional Mounting Kit for LT-84 and LA-141 Transmitters
Listen Technologies LA-344 Omnidirectional Mounting Kit for LT-84 and LA-141 Transmitters
The Listen Technologies LA-344 is an omnidirectional wall, ceiling or table mounting kit for LT-84 ListenIR Transmitter/Radiator Combo and LA-141 ListenIR Expansion Radiator.  This mounting system is modular and the finished lengths ...
54.00

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Listen Technologies LA-303 Multi-Lingual Assistive Listening Notification Sign
Listen Technologies LA-303 Multi-Lingual Assistive Listening Notification Sign
The Listen Technologies LA-303 is a multi-lingual Assistive Listening Notification Sign engineered to Assistive Listening standards. The LA-303 is made of a dense foam core for easy wall mounting with the foam tape. It can also ...
22.00

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Listen Technologies LA-347  Wall Box Mounting Plate for LT-84/LA-141/LT-140
Listen Technologies LA-347 Wall Box Mounting Plate for LT-84/LA-141/LT-140
The LA-347 Wall Box Mounting Plate from Listen Technologies is a single gang mounting plate that fits a standard electrical wall box. It provides a sturdy mount for the LA-84, LA-141, or LA-140 IR radiators. The wall plate has a ...
14.00

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Listen Technologies LPT-A117  Remote Power Supply Kit for LT-84
Listen Technologies LPT-A117 Remote Power Supply Kit for LT-84
Intended for use with Listen Technologies' LT-84 ListenIR Transmitter/Radiator, the LPT-A117 Remote Power Supply Kit utilizes one CAT5e cable for power transmission. The single-cable design and compact size make for a simple solution for a ...
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