The Advanced Installed Stationary IR System provides great signal coverage in a venue while keeping the overall cost of the system low. Because the LS-82 includes rechargeable batteries and a charging station, it is ideal for frequent use. Includes eight (8) stetho receivers, NiMH rechargeable battery packs and a charging station. The system can cover up to 20,000 ft² (1,858 m²). Listen’s IR systems are designed for applications that require the audio signal to be isolated for security or other reasons, such as assistive listening, soundfield, language interpretation, live theater, houses of worship, courtrooms, secure rooms, and for auditory description. Custom systems available. Available with both grey or white radiator options. 


One (1) LT-82 Stationary IR Transmitter
One (1) LA-326 Universal Rack Mounting Kit
Two (2) LA-140 Stationary IR Radiators
Eight (8) LR-42 IR Stethoscope 4-Channel Receivers
Eight (8) LA-364 NiMH Rechargeable Battery Pack for Stationary IR Receivers
One (1) LA-350 8-Unit IR Charging/Storage Station
One (1) LA-304 Assistive Listening Notification Signage Kit


  • Accommodates up to eight (8) listeners – great for applications to accommodate small to medium sized groups
  • Outstanding coverage – 20,000 ft² (1,858 m²)
  • Secure wireless communication – ideal for applications where isolation of the signal is important
  • Up to four (4) channels mono or stereo – no need to sacrifice multiple channels to achieve stereo transmissions
  • Easy to specify, install and use
  • Outstanding performance ensures crystal clear sound for listeners
Configurations & Architectural Specs


LS-82-01-GY Advanced Installed Stationary IR System -Grey (North America)*
LS-82-02-GY Advanced Installed Stationary IR System -Grey (Asia, UK)*
LS-82-03-GY Advanced Installed Stationary IR System -Grey (Euro)*
LS-82-04-GY Advanced Installed Stationary IR System -Grey (Australia)*
LS-82-01-WH Advanced Installed Stationary IR System -White (North America)*
LS-82-02-WH Advanced Installed Stationary IR System -White (Asia, UK)*
LS-82-03-WH Advanced Installed Stationary IR System -White (Euro)*
LS-82-04-WH Advanced Installed Stationary IR System -White (Australia)*

*01, 02, 03, and 04 designation refers to international plug type (type B, G, C, and I) for the power supply. 

Architectural Specs

The LS-82 Advanced Installed Stationary IR System shall use infrared (IR) light to transmit audio from IR emitting radiators to portable IR receivers. The system shall use IR modulating frequencies above 2.0 MHz. The system transmitter shall have a timer that shuts off the carriers after 30 minutes when no audio is present at the transmitter. Channel selection shall be capable of being locked. The system shall be capable of transmitting on four (4) carriers and each of the four (4) carriers shall be capable of transmitting a mono or stereo signal. The system shall have a frequency response of 100 to 15 KHz (+/-3 dB), less than 2% distortion and shall have signal to ratio of greater than 60 dB. A single emitting radiator shall have a transmitting area of no less than 10,000 ft² (929 m²) (one carrier) or greater for each radiator specified. The radiator shall be powered via CAT-5 cabling and the RF from the transmitter shall be carried by 50 ohm coaxial cable. The receivers will be powered by NiMH rechargeable battery packs and include a compact charging station. The LS-82 is specified.

Product Specifications


Shipping Weight30.0 lbs. (13.6 kg)
QHow long will the NiMH batteries last until they need to be recharged?
AYou should receive 15 hours of use from each charge of the batteries.
QCan the LT-82 be operated on 230 VAC?
AYes, the LT-82 has a universal power supply that can be used anywhere in the world.
QIs there any performance degradation in stereo mode?
AYes, stereo operation raises the noise floor slightly.
QCan I operate some channels in mono and others in stereo?
QHow do you replace the batteries in the receiver?
AFor non-rechargeable batteries (AAA alkaline), remove the battery compartment and replace the batteries with fresh AAA alkaline batteries. For rechargeable NiMH batteries, simply replace the sealed battery pack with a freshly charged pack.
QHow do I recharge the NiMH batteries?
AUse the Listen LA-350 8-Unit Charging/Storage unit. This unit will charge batteries that are in receivers or out of receivers.
QHow many carriers does the LT-82 Stationary IR Transmitter produce?
QHow many carriers can be produced simultaneously in a room?
AFour. You will need one LT-82 Stationary IR Transmitter per carrier.
QHow are radiators connected to the LT-82?
AThe carrier (signal) is connected using coax cable; power is connected using standard CAT-5 cabling.
QHow is power delivered to the radiator?
APower is delivered with CAT-5 cables (connected between the radiator and either the LT-82 transmitter or the LA-205 power supply).
QHow many radiators can be powered from the LT-82 or LA-205 power supply?
QHow much coverage is provided with the LA-140 radiator?
A40,000 ft² (3716 m²) single channel with LR-4200-IR/LR-5200-IR receivers or 10,000 ft² (929 m²) single channel with LR-42/LR-44 receivers
QDoes the number of carriers affect the coverage?
AYes, for two sources (carriers), the total coverage is half. For four carriers, the coverage per carrier is one-fourth.
QWhat is the purpose of the delay compensation switch?
AThis switch allows you to set up delay timing in a multi-radiator system so that each radiator receives the carrier at exactly the same time. This prevents signal dropouts that can be caused by out-of-phase signals (multi-path). With Listen’s delay compensation switch, it is not necessary to cut all of your coaxial cables to the same length - your shorter runs can use shorter cables, keeping your installation clean (and cost-effective).
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