Product Datasheet LT 84

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LT-84
ListenIR 2-Channel Transmitter/Radiator Combo

Configuration:
LT-84-01 ListenIR Transmitter/Radiator
Combo (North America)
LT-84-02 ListenIR Transmitter/Radiator
Combo (Asia, UK)
LT-84-03 ListenIR Transmitter/Radiator
Combo (Euro)
LT-84-04 ListenIR Transmitter/Radiator
Combo (Australia)

Product Overview:
The LT-84 ListenIR 2-channel transmitter-radiator (Pat. 9,712,246) from Listen Technologies provides venues, businesses,
government agencies, and more with an affordable and easy-to-use assistive listening solution.
Offering twice the IR power and up to six times the coverage area of similar products, the LT-84 can transmit a clear, reliable
signal across 2,787 square meters (30,000 square feet). This signal range ensures that users in any mid-sized space, from
the boardroom to the courtroom and beyond, enjoy an uninterrupted audio performance.
The LT-84 is also the first infrared assistive listening system to feature expansion radiators (LA-141), which provide delay
compensation to ensure that there are no signal cancellation dropouts. Up to four (4) expansion radiators (LA-141) can be
added to the system to offer additional coverage (when mounted within 30.48 m [100 ft.] from the unit).
In addition, the LT-84 is the only two-channel transmitter-radiator that can transmit on up to four different frequencies (2.3
MHz, 2.8 MHz, 3.3 MHz, or 3.8 MHz). This flexibility in the field makes setup and operation even easier, while also eliminating
the need to purchase separate, frequency-specific transmitter-radiator units.
With the included mounting hardware, and the flexible frequency selection and input connectivity, the LT-84 is an ideal way
to add infrared assistive listening capabilities and ADA compliance to your business or venue.

Highlights:
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

Includes:
One (1) LT-84 ListenIR 2-Channel 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

Product Specification: ListenIR 2-Channel Transmitter/Radiator Combo
Audio
Frequency Response

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

Listen Technologies Corporation * 14912 Heritage Crest Way * Bluffdale * Utah 84065-4818 U.S.A.
+1.801.233.8992 * +1.800.330.0891 North America * +1.801.233.8995 Fax
Listen Technologies Corporation All rights reserved 91407 - Created September 25, 2018
ListenIR 2-Channel Transmitter/Radiator Combo

Page 1 of 3

LT-84
ListenIR 2-Channel Transmitter/Radiator Combo

Product Specification: ListenIR 2-Channel Transmitter/Radiator Combo
Signal-to-Noise Ratio

> 70 dB (SNR) Line Input> 60 dB (SNR) System Specification (wireless end-toend with LR-44)

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
Controls

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
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

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
IR

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

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

Listen Technologies Corporation * 14912 Heritage Crest Way * Bluffdale * Utah 84065-4818 U.S.A.
+1.801.233.8992 * +1.800.330.0891 North America * +1.801.233.8995 Fax
Listen Technologies Corporation All rights reserved 91407 - Created September 25, 2018
ListenIR 2-Channel Transmitter/Radiator Combo

Page 2 of 3

LT-84
ListenIR 2-Channel Transmitter/Radiator Combo

Product Specification: ListenIR 2-Channel Transmitter/Radiator Combo
Power Supply Type

In-line switching mode power supply, Listen part number LA-210

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

Color

Black with White Silk Screening

Unit Weight with Power Supply

1.8 lbs. (0.8 kg)

Shipping Weight

3.4 lbs. (1.54 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

0.8 lbs. (0.4 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

Standards

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

Power Supply Compliance Marks

CUL, UL, CE, CCC, C-Tick, KC, PSE, GS, FCC, RoHS

Listen Technologies Corporation * 14912 Heritage Crest Way * Bluffdale * Utah 84065-4818 U.S.A.
+1.801.233.8992 * +1.800.330.0891 North America * +1.801.233.8995 Fax
Listen Technologies Corporation All rights reserved 91407 - Created September 25, 2018
ListenIR 2-Channel Transmitter/Radiator Combo
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