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The LS-92 ListenIR iDSP Level III System offer increased capacity for larger venues, and comes complete with everything needed to begin providing assistive listening to your visitors immediately.

Designed for small or mid-size venues with up to 100 seats, the LS-92 helps to ensure compliance for courtrooms, boardrooms, classrooms, and more. The system includes our LT-84 ListenIR Transmitter/Radiator Combo, Several LR-4200-IR iDSP receivers, and a LA-381 Intelligent 12-unit Charging Tray for convenient dispensing, collection and storage.

A cost-effective and convenient way to add secure assistive listening capabilities to your venue, the LS-92 is an ideal choice and delivers the highest quality audio experience.


One (1) LT-84-01 ListenIR Transmitter/Radiator Combo
Four (4) LR-4200-IR Intelligent DSP IR Receiver
Four (4) LA-430 Intelligent Ear Phone/Neck Loop Lanyard
Four (4) LA-401 Universal Ear Speaker
One (1) LA-422 USB to Micro USB Cable
One (1) LA-381-01 Intelligent 12-Unit Charging Tray
One (1) LA-382 Intelligent Cable Management Unit
One (1) LA-904 Listen Dispensing Log Book


  • Pre-configured infrared system comes with everything you need to begin offering secure, high-quality assistive listening in your venue
  • Provides outstanding coverage up to 2,787 m2 (30,000 ft2)
  • Comes with all equipment needed to provide assistive listening in venues up to 100 seats
  • Includes transmitter/radiator combo, several iDSP receivers, and a 12-unit charging tray
  • Crystal-clear audio performance for all listeners
  • Integrated neck loops/lanyards provide compatibility with T-coil-equipped devices
  • Designed for single-channel applications
Configurations & Architectural Specs


LS-92-01 ListenIR iDSP Level III System (North America)

Architectural Specs

Furnish and install an IR wireless assistive listening system for use by the hearing-impaired. The assistive listening system (ALS) shall be capable of broadcasting up to two (2) audio channels with the choice of four (4) mono carrier frequencies; 2.3, 2.8, 3.3 and 3.8 MHz.  The system coverage area shall be up to 30,000 ft² (2787 m²) with single channel transmission.  The system shall have a SNR of 60 dB or better and THD of less than 2%. The system shall have an audio frequency response of 63 Hz to 15 kHz, +/- 3db.  The system shall have two (2) independent mixing audio inputs, one for each transmission channel. Each mixing input shall consist of one (1) 3.5 mm Microphone input, one (1) balanced Phoenix type input and one (1) unbalanced RCA input. The system shall have independent channel audio processing with Limiting, Compression and Noise Gate as well as transmit level control and level indication via an LED.  The system shall provide Power and RF signal for up to Four (4) Expansion Radiators over CAT-5 cable for additional coverage.

The system receivers shall be capable of receiving on four (4) wide band channels (carriers), Channel 1 (2.3 MHz), Channel 2 (2.8 MHz), Channel 3 (3.3 MHz) and Channel 4 (3.8 MHz).  The receivers shall be tuned to a single channel and users shall not be able to change the channel. The receivers shall have the option of being lanyard or belt clip worn and the lanyard shall incorporate an integrated neck loop for compatibility with T-coil hearing aids. The receivers shall be intelligent and provide customized audio to either earphones or the integrated neck loop based upon which is connected. The receivers shall have two (2) 3.5 mm (TRRS) connectors to drive the integrated neck loop lanyard or up to two (2) mono or stereo earphones. The receivers shall incorporate a multi-functional display (OLED) that indicates battery status, inventory number, volume level and a customizable channel name. The receivers shall employ a unique iDSPTM noise reduction technology. The receivers shall be fully programmable via PC software.  The receivers shall have a micro USB connector used for programming/setup, inventory control, charging and firmware upgrades. The receivers shall incorporate automatic battery charging circuitry and use a non-proprietary lithium ion battery. The receivers shall automatically turn on when removed from the charging device and automatically turn off when returned to the charging device.  The receivers shall have additional charging contacts to allow for multiple charging options. The Listen Technologies products are specified.

Furnish and install the following:

Listen Technologies LT-84 ListenIR Transmitter/Radiator Combo (Qty: 1 ea.) Includes: LA-210 power supply, LA-344 universal mounting hardware, and LA-303 multi-lingaul assistive listening notification sign (English, Spanish, French)
Listen Technologies LR-4200-IR Intelligent iDSP IR Receiver (Qty: 4 ea.)
Listen Technologies LA-430 Intelligent Ear phone/Neck Loop Lanyard (Qty: 4 ea.)
Listen Technologies LA-401 Universal Ear Speaker (Qty: 4 ea.)
Listen Technologies LA-422 USB to Micro USB Cable (Qty: 1 ea.)
Listen Technologies LA-381-01 Intelligent 12-Unit Charging Tray (Qty: 1 ea.)
Listen Technologies LA-382 Intelligent Cable Management Unit (Qty: 1 ea.)
Listen Technologies LA-904 Listen Dispensing Log Book (Qty: 1 ea.)

QWhat is the purpose of Squelch?
AThe purpose of squelch is to mute the audio output of your receiver when the signal from the transmitter is turned off or is too weak to be received. Without squelch you would hear radio noise in your earphone. The squelch function can be programmed to the desired setting.
QHow many channels (carriers) can the LT-84 produce?
ATwo (2) channels.
QHow many channels (carriers) can be produced simultaneously in a room?
AFour (4) channels. You will need two (2) LT-84 (2 carriers per LT-84).
QWhat is the coverage area provided by the LT-84?
A30,000 ft² (2787 m²) single channel with LR-4200-IR/LR-5200-IR receivers or 7,500 ft² (697 m²) single channel with LR-42/LR-44 receivers
QDoes the number of channels (carriers) affect the coverage area?
AYes, for one (1) channel (carrier), the line-of-sight coverage area is 30,000 ft² (2787 m²) and for two (2) channels (carriers), the line-of-sight coverage area is 15,000 ft² (1394 m²) with LR-4200-IR/LR-5200-IR receivers.
QHow many Expansion Radiators (LA-141) can you use on a system?
AYes, for one (1) channel (carrier), the line-of-sight coverage area is 30,000 ft² (2787 m²) and for two (2) channels (carriers), the line-of-sight coverage area is 15,000 ft² (1394 m²) with LR-4200-IR/LR-5200-IR receivers.
QHow do I connect multiple Expansion Radiators (LA-141)?
AA maximum of two (2) LA-141s can be connected to each Expansion Link output RJ-45 on the LT-84 with a maximum daisy chained CAT-5e cable length of 100 ft. (30.5 m). CAT-5e cable must be at least 24 AWG!
QWhat is the warranty of the LT-84?
AThe LT-84 has a 3-year warranty. Listen Warranty
QWhat is the warranty on the Lithium-ion battery?
AThe Lithium-ion battery has a 1 year warranty. All other accessories have a 90-day warranty. Listen Warranty
QWhat type of battery technology does the LR-4200 use?
AThe LR-4200 uses a non-proprietary field replaceable Lithium Ion battery.
QHow long does it take to fully charge the LR-4200?
AIt varies dependent on the depletion of the battery. A fully depleted battery will charge in 2.5 hours or less.
QHow many LR-4200 receivers can I use in a system?
AAs many as you need, the number is endless.
QHow long will the LR-4200 run on a fully charged battery?
AThe LR-4200 will run continuously for 8 hours on a fully charged battery
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