Listen Technologies LS-94 IR Advanced iDSP Level II System, LT-84-01 Transmitter, 2x LR-5200-IR Receiver, LA-422 USB to Micro USB Cable

SKU: LTLS9401 MFR: LS-94-01
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Key Features

  • Crystal-clear audio: Experience superior sound quality with the advanced iDSP system.
  • Enhanced listening: Perfect for theaters, classrooms, and assistive listening needs.
  • IR Technology: Secure & reliable infrared ensures private, interference-free communication.
  • Easy to use: Intuitive controls and plug-and-play setup for seamless operation.
  • Versatile system: Connects to various devices with balanced & unbalanced line inputs.
  • Complete package: Includes transmitter, receivers, & accessories for immediate use.
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Special Order?Estimated to Ship: 09/12/2025
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Listen Technologies LS-94 Specifications

Transmitter: Audio

Transmitter: Audio

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  • Frequency Response

    20 Hz - 20 kHz (+/- 1 dB) Line Input63 Hz - 15 kHz (+/- 3 dB) System Specification (wireless end-to-end with LR-44)

  • Signal-to-Noise Ratio

    > 70 dB (SNR) Line Input> 60 dB (SNR) System Specification (wireless end-to-end with LR-44)

  • Microphone Input

    Two (2) 0.14" (3.5mm) Tip/Sleeve connector, -30 dBu nominal input, +14 dB headroom, impedance 4.4k Ohms, 5 VDC bias supply

  • Total Harmonic Distortion

    < 0.1% (THD) Line Input< 2% (THD) System Specification (wireless end-to-end with LR-44)

  • Unbalanced Line Input

    Stereo/Mono Input. Two (2) Dual (RCA) Phono connectors, unbalanced, -10 dBu nominal input, +14 dB headroom, impedance 10k Ohms

  • Balanced Line Input

    Mono Input. Two (2) Phoenix Type connector, balanced, + 4 dBunominal input, +14 dB headroom, impedance 100k Ohms

Transmitter: Controls

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  • Power Switch

    Three (3) position switch - Power OFF, Power ON-Indicator Lights OFF, Power ON-Indicator Lights ON

  • Carrier Frequency Selection

    Two (2), four (4) position rotary switches (2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz)

  • Level Control Knob

    Two (2) audio taper rotary potentiometer, counter-clockwise decreases input mix level, clockwise increases input mix level

Transmitter: Indicators

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  • Power Supply LED

    Green LED on in-line power supply indicates AC power is applied

  • Audio Level Indicators

    Two (2) Green LEDs, two (2) Red LEDs, Green LED indicates Audio presence and Red LED indicates peaks in the audio

  • RJ-45 Amber LED

    Solid Amber indicates carrier is present and IR is being transmitted

  • RJ-45 Green LED

    Solid Green indicates power is applied to unit, flashing indicates unit has entered power save mode

Transmitter: RF

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  • Carrier Frequencies

    2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz, Selectable

  • Number of Channels

    Two (2) channels, Selectable carrier frequency

  • Frequency Accuracy

    +/- .005% stability 0 to 50 Degree C

  • Transmitter Stability

    50 PPM

  • Modulation

    FM Wideband, +/-50kHz deviation max, 50 uS pre-emphasis

  • Power Save Mode

    Carrier will shut off when no audio is present for 15 minutes on both channels to preserve radiator life

  • Expansion Link Output

    Two (2) RJ-45 connectors - Provides RF Signal and Power, CAT-5e cable 24 AWG, 100 ft. maximum cable length, two (2) LA-141s per output connector

Transmitter: IR

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  • Coverage Area

    2,787 sq. m (30,000 sq. ft) single channel with LR-4200-IR/LR-5200-IR receivers or 697 sq. m (7,500 sq. ft) single channel with LR-42/LR-44 receivers

  • IR Emitter Power

    1.49 W

Transmitter: Power

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  • Power Supply Input

    100-240 VAC, 50-60 Hz

  • Power Supply Output

    12 VDC, 4 A, 48 W

  • Power Supply Connector

    2.5 mm ID barrel connector, center positive

  • Power Output

    Two (2) RJ-45 connectors. providing Power and RF signal for up to two (2) LA-141 expansion radiators on each output

  • Power Supply Type

    In-line switching mode power supply, Listen part number LA-210

  • Power Supply Line Cord

    IEC line cord, North America Type B (LT-84-01), Asia and UK Type G (LT-84-02), Euro Type C (LT-84-03), Australia Type I (LT-84-04)

Transmitter: Environmental

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  • Temperature - Operation

    14 Degree F (-10 Degree C) to +104 Degree F (40 Degree C)

  • Temperature - Storage

    -4 Degree F (-20 Degree C) to +122 Degree F (50 Degree C)

  • Relative Humidity

    0 to 95% relative humidity, non-condensing

Transmitter: Compliance

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  • Standards

    FCC part 15, ICS-03, CE, UL, CUL, C-Tick, CCC, PSE, KC, GS, RoHS, WEEE

  • Power Supply Compliance Marks

    CUL, UL, CE, CCC, C-Tick, KC, PSE, GS, FCC, RoHS

Transmitter: Physical

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  • Color

    Black with White Silk Screening

  • Counting

    Can be mounted on a wall, ceiling, or table with provided hardware (screws and hollow wall anchors not provided). Optional LA-347 Wall Box Mounting Plate is available for mounting to a standard single gang electrical box.

  • Compatibility

    LR-42, LR-44, LPT-A117, LA-141, LR-4200-IR, LR-5200-IR, LR-4200-IR-P1, LR-5200-IR-P1, LP-40-IR-01, LP-41-IR, LP-50-IR, LP-51-IR, LR-X200-IR

  • Dimensions (H x W x D)

    1.5 x 10.7 x 4.1" (3.81 x 27.2 x 10.5cm)

  • Weight

    0.8 lb (0.4kg)
    with Power Supply: 1.8 lb (0.8kg)

Receiver: Audio

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  • System Distortion

    < 2% total harmonic distortion (THD) at 80% deviation

  • Audio Output Jacks

    Two (2) 0.14" (3.5mm) connectors, unbalanced, 0 dBu nominal output level, 16 mW maximum, impedance 32 ohm, accepts mono or stereo phone plug or LA-430 Intelligent Ear Phone/Neck Loop Lanyard

  • System Frequency Response

    63 Hz - 15 kHz ( +/-3 dB)

  • System Signal to Noise Ratio

    > 60 dB

Receiver: Controls

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  • User Controls

    Power on/off, volume up/down, Listen button for end user channel selection

  • Programming

    Via software and USB port, Auto Seek, Jack Sense, Squelch, Auto Power, Auto Off, Stereo, Brightness, Channel Name, Channel button, Channel Lock

  • Set-up Controls

    Press and hold up/down volume buttons for 5 seconds to enter channel adjust, use up/down to select channel

Receiver: Indicators

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  • Display

    OLED - Channel designation, battery level, unit number, charging status, volume status

  • LED

    Flashes when batteries are low or to indicate charging, solid when fully charged

Receiver: RF

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  • Carrier Frequencies

    2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz

  • Number of Channels

    Four (4) selectable channels

  • Frequency Accuracy

    +/- .005% stability 32 to 122 Degree F (0 to 50 Degree C)

  • Modulation

    FM Wideband, +/-50 kHz deviation max, 50 uS de-emphasis

Receiver: IR

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  • Coverage Area

    697 sq. m (7,500 sq. ft) single channel with LT-84/LA-141 or 40,000 sq. ft (3716 sq. m) single channel with LT-82/LA-140

  • Squelch

    Programmable in 20 steps, automatic on loss of IR signal

  • Power Save Mode

    Turns unit off after a specified time of no IR signal, default is 30 minutes

  • Sensitivity

    Better than one (1) nW/cm2 @40 dB SNR

Receiver: Power

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  • Power Supply

    Micro USB connector, 5 V, 500 mA

  • Battery Type

    Lithium Ion

  • Battery Life

    8 Hours of typical use

  • Battery Charging Time

    Fully charged in 2.5 Hours

Receiver: Environmental

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  • Temperature - Operation

    14 to 104 Degree F (-10 to 40 Degree C)

  • Temperature - Storage

    -4 to 122 Degree F (-20 to 50 Degree C)

  • Relative Humidity

    0 to 95% relative humidity, non-condensing

Receiver: Compliance

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  • Standards

    FCC Part 15, ICS-03, CE, RoHS, WEEE, ADA 706, CBC 11B-706

Receiver: Physical

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  • Compatibility

    LA-140-GY, LT-82, LA-365, LA-401, LA-405, LA-404, LA-403, LA-402, LA-430, LT-84, LA-141

  • Color

    Flat Black

  • Dimensions (H x W x D)

    Without Belt Clip: 3.75 x 2.0 x 0.64" (9.6 x 5.0 x 1.7cm)
    With Belt Clip: 3.75 x 2.0 x 0.80" (9.6 x 5.0 x 2.1cm)

  • Weight

    Without Batteries: 1.9 oz (53.9g)
    With Batteries: 2.8 oz (79.4g)

About Listen Technologies LS-94

Under the banner of sophisticated audio solutions, the LS-94 ListenIR Advanced iDSP Level II System stands out as a state-of-the-art assistive listening package, ideal for enhancing auditory experiences in environments such as courtrooms, classrooms, and venues with seating capacities of up to 50 individuals. This comprehensive system includes the innovative LT-84 ListenIR Transmitter/Radiator Combo, paired with two high-tech LR-5200-IR receivers, providing a seamless and advanced auditory setup for immediate use.

The system's versatility is further enhanced by the inclusion of the LA-381 Intelligent 12-Unit Charging Tray, which simplifies the process of expanding the number of receivers for growing needs. This tray offers a streamlined solution for charging, storing, and managing the receivers, ensuring they are ready for use whenever necessary.

With its exceptional coverage spanning up to 30,000 sq ft (2787 sq m) on a single channel transmission and a superior signal-to-noise ratio (SNR) of 60 dB or better, the LS-94 delivers unmatched clarity and reliability. The system's total harmonic distortion (THD) remains under 2%, and it boasts an audio frequency response from 63 Hz to 15 kHz, +/- 3db, ensuring high-fidelity sound reproduction.

The LS-94 is equipped with two independent mixing audio inputs for each transmission channel, featuring versatile connectivity options including a 3.5 mm Microphone input, a balanced Phoenix type input, and an unbalanced RCA input. Advanced audio processing capabilities such as Limiting, Compression, and Noise Gate, along with transmit level control and LED level indication, are integrated to maintain optimal audio quality.

Designed to accommodate up to four Expansion Radiators via CAT-5 cabling, the system ensures extensive coverage. The LR-5200-IR receivers are adept at receiving four wide band channels, with a programmable multi-function Listen button that can be customized for the venue's preferred channels, while also providing the option to electronically lock out unused channels.

The receivers are designed for user comfort and convenience, offering the flexibility to be worn with a lanyard or belt clip. The integrated neck loop lanyard is T-coil hearing aid compatible, enhancing accessibility for hearing-impaired users. The receivers are intelligent, automatically adjusting the audio output for earphones or the neck loop based on the connected device.

Featuring a multi-functional OLED display, the receivers provide essential information such as battery status, inventory number, volume level, and a customizable channel name. They incorporate iDSP noise reduction technology for crystal-clear sound and are fully programmable via PC software. The micro USB connector serves multiple purposes, including programming, inventory control, charging, and firmware updates.

The receivers utilize a non-proprietary lithium-ion battery with automatic charging circuitry, turning on when removed from the charging device and off when returned, further simplifying operation. Additional charging contacts allow for multiple charging options, ensuring the receivers are always powered and ready for use.

The LS-94 IR Advanced iDSP Level II System by Listen Technologies represents an innovative and sophisticated choice for venues seeking a high-performance, comprehensive assistive listening solution.

Listen Technologies LS-94 Features

  • Advanced iDSP IR assistive listening system with our LR-5200-IR receivers included
  • Pre-configured system designed for simple and immediate installation
  • 12-unit charging tray makes it easy to add and store additional receivers
  • Ideal for small- to mid-size venues with up to 50 seats
  • Provides outstanding coverage up to 2,787 sq. m (30,000 sq. ft)
  • Designed for multi-channel applications where users need the ability to select audio source/channel themselves

Product Documents

User Manual

Key Features

  • Crystal-clear audio: Experience superior sound quality with the advanced iDSP system.
  • Enhanced listening: Perfect for theaters, classrooms, and assistive listening needs.
  • IR Technology: Secure & reliable infrared ensures private, interference-free communication.
  • Easy to use: Intuitive controls and plug-and-play setup for seamless operation.
  • Versatile system: Connects to various devices with balanced & unbalanced line inputs.
  • Complete package: Includes transmitter, receivers, & accessories for immediate use.

What's in the box:

  • LT-84-01 ListenIR Transmitter/Radiator Combo
  • 2x LR-5200-IR Advanced Intelligent DSP IR Receiver
  • 2x LA-430 Intelligent Ear Phone/Neck Loop Lanyard
  • 2x LA-401 Universal Ear Speaker
  • LA-422 USB to Micro USB Cable
  • LA-381-01 Intelligent 12-Unit Charging Tray
  • Listen Technologies Lifetime Limited Warranty