Listen Technologies LT-84-01, LA-141 Users Manual
User Manual
Installation and Operation
LT-84 ListenIR Transmitter/Radiator Combo
LA-141 ListenIR Expansion Radiator
PAGE 1
Table of Contents
Safety Cautions!.. ................................................................................................................................... 2
Recycling Instructions .......................................................................................................................... 2
Compliance Information ...................................................................................................................... 3
Compliance Notice, FCC and Industry Canada Statements ......................................................... 3
System Overview ................................................................................................................................... 4
LT-84 ListenIR Transmitter/Radiator Combo .................................................................................. 5
Package Contents ........................................................................................................................... 5
LT-84 Rear View Quick Reference ...................................................................................................... 5
LA-141 ListenIR Expansion Radiator .................................................................................................. 6
Package Contents ........................................................................................................................... 6
LA-141 Rear View Quick Reference .................................................................................................... 6
LT-84 and LA-141 Coverage .................................................................................................................. 7
Designing a System ............................................................................................................................... 9
Flexible Mounting Hardware Instructions..................................................................................... 10
Mounting Hardware Kit ............................................................................................................... 10
Mounting Provision Thread ¼” x 20 (6mm x 1.0 thread) ......................................................... 10
Wall Surface Mounting Example ................................................................................................ 11
Ceiling Surface Mounting Example ............................................................................................ 11
Mounting Two Units with Linking Mount Example .................................................................. 11
Interconnection and Control ............................................................................................................ 12
Connection of the External Power Adaptor .............................................................................. 12
Connection of External Audio Sources ...................................................................................... 13
IR Frequency Selection/Control .................................................................................................. 14
ListenIR Expansion Link RJ-45 Connections .............................................................................. 15
Indicator Lights ............................................................................................................................. 16
Troubleshooting ........................................................................................................................... 17
LT-84 Specications ..................................................................................................................... 18
LA-141 Specications ................................................................................................................... 19
Warranty Information ........................................................................................................................ 20
Technical Support Contact ................................................................................................................ 21
PAGE 1
Safety Cautions!
CAT-5e Cable Safety:
Do NOT Plug the LT-84 (ListenIR Transmitter/Radiator Combo) CAT-5e cable into anything other than an
LA-141 (ListenIR Expansion Radiator). The LT-84 CAT-5e Expansion Output RJ-45 connection is proprietary
and is not compatible with Ethernet or any other system. Failure to comply with this caution can damage
the LT-84, LA-141 or other equipment and will void the warranty.
Hearing Safety:
The LT-84 is designed to be used with Listen Technologies receivers. These receivers are designed to
amplify audio to a high volume level which could potentially cause hearing damage if used improperly.
To protect your hearing, make sure the volume is turned down before putting on the ear speaker or
headphones, then adjust the volume up to the minimum setting require to hear clearly. Do not allow
children or other unauthorized individuals to have access to this product without supervision.
Medical Device Safety:
Before using Listen Technologies receivers with an implantable or other medical device, consult your
implantable or other medical device physician or manufacturer. Always make sure you are using this
product in accordance with the safety guidelines established by your physician or the implantable device
manufacturer.
Recycling Instructions
Recycling:
Help Listen Technologies protect the environment by taking the time to dispose of your equipment
properly.
Product Recycling Instructions:
Please do NOT dispose of your Listen Technologies equipment in the household trash. Please
take the equipment to an electronics recycling center; OR, return the product to the factory
for proper disposal.
Battery Recycling Instructions:
Please do NOT dispose of batteries in the household trash. Please take the batteries to a
retail or community collection point for recycling.
PAGE 2
Compliance Information
No FCC license or radio approval is required to operate this equipment.
Compliance Notice,
FCC and Industry Canada Statements
Compliance Notice
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) These devices may not cause harmful interference, and (2) these devices must accept any interference
received, including interference that may cause undesirable operation.
FCC Statement
This equipment has been tested and found to comply with the limits for a class B digital device, pursuant
to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can radiate radio frequency
energy and if not installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment o and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit dierent from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
The user is cautioned that changes and modications made to the equipment without the approval of
manufacturer could void the user’s authority to operate this equipment.
Industry Canada Statement
This equipment complies with ICES-003 class B.
CAN ICES-3 (B)/NMB-3(B)
PAGE 3
System Overview
The LT-84 is an all-in-one two channel infrared (IR) transmitter and radiator (Transmitter/Radiator Combo)
packed into a single mountable enclosure. The LT-84 IR radiator is located behind the IR transparent front
panel and provides line-of-sight coverage of 30,000 ft2 (2787 m2) with LR-4200-IR/LR-5200-IR receivers or
7,500 ft2 (697 m2) with LR-42/LR-44 receivers.
The LT-84 is perfect for high-quality audio applications like assistive listening, audio description or
language interpretation in corporate boardrooms, courtrooms, training rooms, classrooms, and theaters.
Its exible audio inputs accept microphone, consumer and line level inputs which are all mixed to the
modulated IR transmission. IR receivers then detect the modulated IR transmission and convert the IR
signals back into an audio signal and presents it to headphones.
For better line of sight coverage or for coverage in larger areas the LT-84 can be combined with up to
four (4) LA-141 Listen IR Expansion Radiators. The LA-141s are connected in a daisy chain fashion to the
LT-84 via a 24 AWG unshielded CAT-5e cable. A maximum of two (2) LA-141s can be connected to each
expansion link output on the LT-84 with a maximum cable length of 100 ft. (30 m).
LT-84
Power
Power Supply
Microphone (Electret)
Unbalanced Audio Source
Balanced Audio Source
LA-141
(Optional)
LA-141
(Optional)
MIC
RCA
CAT-5e
Phoenix
Connector
LA-141
(Optional)
LA-141
(Optional)
CAT-5e
(24 AWG)
CAT-5e
PAGE 4
LT-84 ListenIR Transmitter/Radiator Combo
Package Contents
LT-84 ListenIR Transmitter/Radiator Combo
LA-210 12 VDC Universal Power Supply
Power Cord
LA-344 Mounting Hardware
(2) Phoenix Type Connectors
Quick Start Guide
LA-303 Small Room Signage Kit
LA-84 Stationary IR Transmitter/Radiator Combo
Power Cord
LA-210 12 VDC Universal Power Supply
Hearing Assistance Available
Asistencia auditiva a su disposición
Aide à l’audition
Mount Adaptor
This facility is equipped with a hearing assistance system.
Please ask for a receiver.
Este establecimiento está equipado con un sistema
de asistencia auditiva. Por favor solicite un receptor.
Cet éstablissement est équipé d’un système d’aide
à l’audition. S’il vous plaît demandez un récepteur.
Quick Start Guide
LA-303 Small Room Signage Kit
Mounting
Plate Cover
LT-84 Rear View Quick Reference
LT-84 Rear View
Safety/Security
Cable Slot
Mic
Input
Level Control
Knob
Frequency
Selector
Mic
Input
Level Control
Pan & Tilt
1/4” x 20
All Thread Piece
Frequency
Selector
Knob
LA-344 Mounting Hardware
2” Extension Bars
Flush Mounting Plate
Expansion Link
Amber LED
(Status Indicator)
(2) Phoenix Type
Connectors
Output RJ-45
Ceiling Tile
Mounting Plate
Pan and Tilt
Lock Screw
Hex Key
Power Input
Power Switch
Indicator Lights
On/O
RCA Input
(Stereo)
Line Input
Level
Indicators
Transmission
On/O
RCA Input
(Stereo)
Line Input
Level
Indicators
Transmission
Green LED
(Power Indicator)
On/O
PAGE 5
LA-141 ListenIR Expansion Radiator
Package Contents
LA-141 ListenIR Expansion Radiator
(1) 25 ft. (7.6 m) CAT-5e Cable
LA-344 Mounting Hardware
Quick Start Guide
LA-141 Listen IR Transmitter/Radiator Combo
LA-344 Mounting Hardware
Pan & Tilt
1/4” x 20
Mount Adaptor
Ceiling Tile
Mounting Plate
All Thread Piece
Mounting Plate
Cover
2” Extension Bars
Flush Mounting Plate
Hex Key
Pan and Tilt
Lock Screw
LA-141 Rear View Quick Reference
LA-141 Rear View
Safety/Security
Cable Slot
Expansion Link
In/Out RJ-45
(1) 25 ft. (7.6 m) CAT-5e Cable
Quick Start Guide
Amber LED
(Status Indicator)
PAGE 6
Indicator Lights
On/O
Channel 1
Delay
Compensation
Channel 2
Delay
Compensation
Green LED
(Power Indicator)
LT-84 and LA-141 Coverage
The units emit a beam of infrared light from the front panel. Infrared light is not visible to the human eye.
Below is a scaled diagram of the typical line-of-sight IR pattern or “footprint” emitted from the units.
When using a unit in single channel transmit mode the coverage area is 30,000 ft2 (2787 m2) and in 2
channel transmit mode the coverage area is 15,000 ft2 (1394 m2). Use the diagrams below when evaluating
a given space to determine the number of units required and placement of those units for
best line-of-sight coverage with an LR-4200-IR or LR-5200-IR receiver.
Figure 1: LT-84 or LA-141 Single Unit Coverage Pattern “footprint” 1 & 2 Channel Transmission
Figure 2: LT-84 and LA-141 Single Channel Coverage Pattern “footprint” from same emission point
(40% increase)
PAGE 7
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