Listen Technologies LT-84 User manual

Quick Start Guide

LT-84 ListenIR Transmitter/Radiator Combo

LA-141 ListenIR Expansion Radiator

Determine Unit Placement

Determine the optimum location where the LT-84 and LA-141 units will

cover the intended area. Preferably, mount the units above and point

them towards the listening audience. Units cannot be concealed behind

walls, curtains, or treated glass, as Infrared (IR) light needs a clear

line-of-sight path to the receiver for best performance.

Mounting Options

The units can be mounted on the ceiling, wall, or desk with the mounting

hardware (included). The threaded connectors on the top and bottom of

the units are a standard size which ﬁts most camera tripods. These

threaded connectors can also be used to connect two units together.

LT-84 Setup

1. Plug power supply into the unit.

2. Connect desired audio input signal to one of the three input connector

types on channel 1, 2, or both.

Safety/Security

Cable Slot

Mic

Input Level Control

Knob

Frequency

Selector

Mic

Input Level Control

Knob

Frequency

Selector

Expansion Link

Output RJ-45

Amber LED

(Status Indicator)

Power Input

Power Switch

Indicator Lights

On/Oﬀ

RCA Input

(Stereo)

Line Input

Level

Indicators

Transmission

On/Oﬀ

RCA Input

(Stereo)

Line Input

Level

Indicators

Transmission

On/Oﬀ

Green LED

(Power Indicator)

LT-141 Rear View

Safety/Security

Cable Slot

Indicator Lights

On/Oﬀ Switch

Expansion Link

In/Out RJ-45

Amber LED

(Status Indicator)

Green LED

(Power Indicator)

Channel 1

Delay

Compensation

Channel 2

Delay

Compensation

LT-84 Rear View

Cable

Length

2.3 MHz

2.8 MHz

3.3 MHz

3.8 MHz

Cable

Length

2.3 MHz

2.8 MHz

3.3 MHz

3.8 MHz

1 to 9 ft.

0.3 to 2.8 m

50 to 59 ft.

15.2 to 18 m

10 to19 ft.

3 to 5.8 m

60 to 69 ft.

18.3 to 21m

20 to 29 ft.

6 to 8.8 m

70 to 79 ft.

21.3 to 24 m

30 to 39 ft.

9.1 to 11.9 m

80 to 89 ft.

24.4 to 27.1 m

40 to 49 ft.

12.2 to 14.9 m

90 to 100 ft.

27.4 to 30.5 m

3. Turn power switch to the “indicator lights on” position*

4. Adjust audio level input knob until the audio level LEDs are solid green

with an occasional red ﬂicker with audio peaks.

5. Select the desired transmission frequency and turn on the channel

transmission switch.

*Once the unit is adjusted, the power switch can be turned to the

“indicator lights oﬀ” position, if desired.

Note: The LT-84 and receivers need to be on the same frequency/channel

for proper operation.

LA-141 Setup

1. Turn the LT-84 power switch to the oﬀ position.

2. Connect the LA-141s to the LT-84 via a CAT-5e 24 AWG cable.†

3. Turn the LT-84 and LA-141 power switches to the “indicator lights on”

position.‡

†Up to 2 LA-141s can be daisy chained to each Expansion Link Output

RJ-45 connector with a daisy chain maximum cable length of 100 ft. (30 m).

‡Under normal operation the green and amber LEDs on the RJ45

connector of both the LT-84 and LA-141 will be illuminated.

Set Delay Compensation

For a single channel application, set both channel 1 and 2 delay

compensation switches to the same setting. For a two-channel

application, set delay compensation switches for channel 1 and 2

independently. Pick appropriate frequency row, then select the column

that describes the overall cable distance from the LT-84 to the LA-141

being set. This is the appropriate delay compensation switch setting.

Delay Compensation Switch Setting

Connection

LT-84

Power

Power Supply

Microphone (Electret)

Unbalanced Audio Source

MIC RCA

Phoenix

Connector

Cat-5e

(24 AWG)

LA-141 (Optional)

Balanced Audio Source

Cat-5e

LA-141 (Optional)

Cat-5e

For more detailed information see user’s manual:

http://www.listentech.com/support/manuals/

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