This product is discontinued and the information here is only for reference.

4-Channel 48-Listener Stationary IR System (Discontinued)


The 4-Channel 48-Listener Stationary IR System delivers clear audio from four (4) audio sources to 48 listeners with consistent great sound and substantial signal coverage. Includes transmitter and radiator mounting hardware, rechargeable batteries and charging stations. It is designed for delivering multi-channel audio in applications such as language interpretation, houses of worship, courtrooms, secure rooms, and for auditory description. It includes four (4) Stationary IR Transmitters, 48 stetho receivers, NiMH rechargeable battery packs and six (6) charging stations. The system can operate between one (1) and four (4) channels of audio and can cover up to 80,000 ft² (7,432 m²). Listen’s IR systems are designed for applications that require the audio signal to be isolated for security or other reasons, such. Custom systems available. Grey or white radiator options available

See Architectural & Engineering Specs

This product is available through authorized resellers.

Request Quote


Four (4) LT-82 Stationary IR Transmitter
Two (2) LA-326 Universal Rack Mounting Kit
Three (3) LA-89 Interconnection Coaxial Cable
Eight (8) LA-140 Stationary IR Radiator
Forty-eight (48) LR-42 IR Stethoscope 4-Channel Receiver
Forty-eight (48) LA-364 NiMH Rechargeable Battery Pack
Six (6) LA-350 8-Unit IR Charging/Storage Station
Two (2) LA-304 Assistive Listening Notification Signage Kit


  • Accommodates up to 48 listeners – great for applications to accommodate large groups
  • Outstanding coverage – 80,000 ft² (7,432 m²)
  • Secure wireless communication – ideal for applications where isolation of the signal is important
  • Up to four (4) channels mono, or four channels 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

Also Needed



Shipping Weight140.0 lbs. (63.6 kg)



+How long will the NiMH batteries last until they need to be recharged?

You should receive 15 hours of use from each charge of the batteries.

+Can the LT-82 be operated on 230 VAC?

Yes, the LT-82 has a universal power supply that can be used anywhere in the world.

+Is there any performance degradation in stereo mode?

Yes, stereo operation raises the noise floor slightly.

+Can I operate some channels in mono and others in stereo?


+How do you replace the batteries in the receiver?

For 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.

+How do I recharge the NiMH batteries?

Use the Listen LA-350 8-Unit Charging/Storage unit. This unit will charge batteries that are in receivers or out of receivers.

+How many carriers does the LT-82 Stationary IR Transmitter produce?


+How many carriers can be produced simultaneously in a room?

Four. You will need one LT-82 Stationary IR Transmitter per carrier.

+How are radiators connected to the LT-82?

The carrier (signal) is connected using coax cable; power is connected using standard CAT-5 cabling.

+How is power delivered to the radiator?

Power is delivered with CAT-5 cables (connected between the radiator and either the LT-82 transmitter or the LA-205 power supply).

+How many radiators can be powered from the LT-82 or LA-205 power supply?


+How much coverage is provided with the LA-140 radiator?

40,000 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

+Does the number of carriers affect the coverage?

Yes, for two sources (carriers), the total coverage is half. For four carriers, the coverage per carrier is one-fourth.

+What is the purpose of the delay compensation switch?

This 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).