Listen Technologies LS-88 Portable ListenIR iDSP System, LT-84-01 Transmitter, 2x LR-4200 IR Receiver

SKU: LTLS8801 MFR: LS-88-01
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Key Features

  • Crystal-clear audio: Experience superior sound quality with Listen Technologies' advanced DSP IR receivers.
  • Portable assistive listening: Perfect for tours, meetings, and classrooms needing audio solutions.
  • Expandable IR coverage: Enhance your listening area up to 30,000 sq ft with the LT-84 ListenIR system.
  • Easy to use: Intuitive controls and plug-and-play setup for seamless audio presentations.
  • Long-lasting battery: Enjoy up to 8 hours of continuous use with the efficient Lithium Ion batteries.
  • Versatile connectivity: Connect various audio sources via balanced, unbalanced, and mic inputs.
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Special Order?Estimated to Ship: 09/23/2025
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Listen Technologies LS-88 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) 3.5 mm (0.14 in.) 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 m 2 (30,000 ft 2) single channel with LR-4200-IR/LR-5200-IR receivers or 697 m 2 (7,500 ft 2) 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) 3.5 mm (0.14 in.) 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 and volume up/down

  • Programming

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

  • Set-up Controls

    Press and hold up/down volume buttons for 5 seconds to enterchannel 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

    30,000 sq. ft (2787 sq. m) 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-381, LA-405, LA-404, LA-403, LA-402, LA-380, LA-430, LT-84, LA-141, LA-382

  • 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 2.1 cm)

  • Weight

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

About Listen Technologies LS-88

Experience the power of comprehensive auditory assistance with the LS-88-01 Portable ListenIR iDSP system. Designed to meet all IBC and ADA requirements, this system is perfect for small to medium-sized rooms, accommodating up to 50 individuals. It's a portable solution, easily transported and stored in its dedicated carrying case, making it ideal for a variety of settings, from classrooms and conferences to boardrooms and jury deliberation rooms.

The LS-88-01 system is more than just a transmitter; it's a complete package that includes a ListenIR Transmitter/Radiator Combo, receivers, ear speakers, and neck loop lanyards for multiple users, along with other necessary equipment. It's designed to provide on-demand assistive listening, ensuring that everyone in the room can participate fully.

This advanced assistive listening system (ALS) is capable of broadcasting up to two audio channels, offering a choice of four mono carrier frequencies: 2.3, 2.8, 3.3, and 3.8 MHz. With single channel transmission, the system can cover an area of up to 30,000 ft2 (2787 m2). It boasts a signal-to-noise ratio (SNR) of 60 dB or better and total harmonic distortion (THD) of less than 2%, ensuring clear, high-quality sound.

The system's audio frequency response ranges from 63 Hz to 15 kHz, +/- 3db, and includes an omnidirectional tabletop microphone for optimal audio pickup. The receivers are tuned to a single channel, with no user ability to change the channel, ensuring a consistent listening experience for all users. They can be worn with a lanyard or belt clip, and the lanyard incorporates an integrated neck loop for compatibility with T-coil hearing aids.

The receivers are intelligent, providing customized audio to either earphones or the integrated neck loop based on which is connected. They feature two 3.5 mm (TRRS) connectors to drive the integrated neck loop lanyard or up to two mono or stereo earphones. A multi-functional OLED display indicates battery status, inventory number, volume level, and a customizable channel name.

Incorporating unique iDSPTM noise reduction technology, the receivers are fully programmable via PC software and feature a micro USB connector for programming/setup, inventory control, charging, and firmware upgrades. They use a non-proprietary lithium-ion battery and incorporate automatic battery charging circuitry. The receivers automatically turn on when removed from the charging device and turn off when returned, adding to the ease of use. Experience the LS-88-01 Portable ListenIR iDSP system, a complete solution for assistive listening needs.

Listen Technologies LS-88 Features

  • Pre-configured transmitter/radiator, receivers, microphone and more for immediate assistive listening wherever it is needed
  • Offers ideal coverage for small to medium venues with up to 50 seats
  • Easy to set up, tear down, and transport
  • Offers crystal-clear audio performance in classrooms, conferences, boardrooms and more
  • Multiple receivers, neck loop/lanyards, and ear speakers are included

Product Documents

User Manual

Key Features

  • Crystal-clear audio: Experience superior sound quality with Listen Technologies' advanced DSP IR receivers.
  • Portable assistive listening: Perfect for tours, meetings, and classrooms needing audio solutions.
  • Expandable IR coverage: Enhance your listening area up to 30,000 sq ft with the LT-84 ListenIR system.
  • Easy to use: Intuitive controls and plug-and-play setup for seamless audio presentations.
  • Long-lasting battery: Enjoy up to 8 hours of continuous use with the efficient Lithium Ion batteries.
  • Versatile connectivity: Connect various audio sources via balanced, unbalanced, and mic inputs.

What's in the box:

  • LT-84-01 ListenIR Transmitter/Radiator Combo
  • 2x LR-4200 IR Intelligent DSP IR Receiver
  • 2x LA-430 Intelligent Ear Phone/Neck Loop Lanyard
  • 2x LA-401 Universal Ear Speaker
  • LA-277 Conference Microphone
  • LA-338 Table Top Tripod
  • LA-346 Carrying Case
  • LA-423 4-Port USB Charger
  • Listen Technologies Lifetime Limited Warranty