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Z-LT-84 Transmitter/Radiator Combination Unit

The Z-LT-84 is a 2 channel Infrared transmitter and radiator that is easy to use and install

The Z-LT-84 is a 2 channel Infrared transmitter and radiator that is easy to use and install whilst also being a cost effective system that can provide a large area coverage. One CAT-5e cable provides both the power and the audio signal to the transmitter and to the Z-LA-141 expansion radiator.

Combined with Z-LR-4200 and Z-LR-5200 infra red receivers the Z-LT-84 can provide up to 30,000 ft² of coverage without gaps or null spaces. So to provide maximum flexibility in the field the two channel system can use up to four frequencies.

Available with a multitude of mounting and accessories options this infrared assistive listening system can provide for an array of applications.

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Affordable, effective, and expandable solution ideal for small to mid-size spaces such as classrooms, courtrooms, boardrooms, and more

Multiple frequency options offer additional flexibility and simplicity during installation and setup

Offers gapless coverage up to 2,787 square meters (30,000 square feet)

Can be expanded with up to four (4) LA-141 expansion radiators for additional coverage area

One-cable design utilizes a single CAT-5e to carry both power and signal to LA-141 expansion radiators

Multiple input options for easier setup and operation


  • Assistive listening
  • Language interpretation
  • Live theatre
  • Houses of worship
  • Courtrooms
  • Secure rooms

Standards Compliance

StandardsFCC Part 15, ICS-03, CE, RoHS, WEEE


Frequency Response 20 Hz - 20 kHz (+/- 1 dB) Line Input63 Hz - 15 kHz (+/- 3 dB) System. Specification (wireless end-to-end with LR-44).

Signal-to-Noise Ratio > 70 dB (SNR) Line Input> 60 dB (SNR) System Specification

Microphone Input Two (2) 3.5 mm (0.14 in.) Tip/Sleeve connector, -30 dBu nominal input, +14 dB headroom, impedance 4.4k Ohms, 5 VDC bias supply

Total Harmonic Distortion < 0.1% (THD) Line Input< 2% (THD) System Specification (wireless end-to-end with LR-44)

Unbalanced Line Input Stereo/Mono Input. Two (2) Dual (RCA) Phono connectors, unbalanced, -10 dBu nominal input, +14 dB headroom, impedance 10k Ohms

Balanced Line Input Mono Input. Two (2) Phoenix Type connector, balanced, + 4 dBunominal input, +14 dB headroom, impedance 100k Ohms


Power Switch Three (3) position switch - Power OFF, Power ON-Indicator Lights OFF, Power

ON-Indicator Lights ON

Carrier Frequency Selection Two (2), four (4) position rotary switches (2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz)

Level Control Knob Two (2) audio taper rotary potentiometer, counter-clockwise decreases input

mix level, clockwise increases input mix level


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


Carrier Frequencies 2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz, Selectable

Number of Channels Two (2) channels, Selectable carrier frequency

Frequency Accuracy +/- .005% stability 0 to 50 °C

Transmitter Stability 50 PPM

Modulation FM Wideband, ±50kHz deviation max, 50 ?S pre-emphasis

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 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


Coverage Area 2,787 m² (30,000 ft²) single channel with LR-4200-IR/LR-5200-IR receivers or

697 m² (7,500 ft²) single channel with LR-42/LR-44 receivers

IR Emitter Power 1.49 W


Power Supply Input 100-240 VAC, 50-60 Hz

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


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