Listen Technologies LS-55-072 Listen iDSP Prime Level III Stationary RF System, LT-800-072 Transmitter, 4x LR-4200-072 Receiver, LA-381-01 Charging Tray, 72 MHz

SKU: LTLS55072 MFR: LS-55-072
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Key Features

  • Crystal-clear audio: The Listen iDSP system delivers exceptional sound quality.
  • Assistive listening system ensures everyone can comfortably hear presentations.
  • Easy to use: Set up the stationary RF transmitter quickly for seamless operation.
  • Includes 4 LR-4200-072 receivers with DSP for enhanced audio clarity.
  • Perfect for theaters: Improve accessibility with reliable audio solutions.
  • Long-lasting battery: Enjoy up to 8 hours of continuous use with the receivers.
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Special Order?Estimated to Ship: 08/21/2025
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Listen Technologies LS-55-072 Specifications

Includes

Includes

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  • Additional Included items

    LA-122 Universal Antenna Kit Including (Grounding Base + Mounting Bracket + Wall/Electrical Box Mounting Plate + Shorting Plate + Antenna Module + (25'/7.6m) Coaxial Cable (Terminated with BNC Connectors on Both Ends) + 2x Telescoping Antennae (72 MHz) + 2x Flexible Antenna (72 MHz) + 2x Hex Kep Nuts + 2x Fiber Washer + 4x Machine Screw (#8-32 x3/4") + 4x Tapping Screw (#8-1/2") + 4x Dry Anchors)

  • Additional Included items (Contd.)

    LA-326 Universal Rack Mounting Kit Including (Left Side Bracket + Right Side Long Bracket + Right Side Short Bracket + Dual Mount Center Bracket + 10x Machine Screws)

    LA-304 Assistive Listening Notification Signage Kit Including (Hard Plaque + Static Cling Window Sticker)

Transmitter: Audio

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  • Frequency Response

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

  • Signal-to-Noise Ratio

    SQ enabled 80 dB, SQ disabled 60 dB

  • Audio Input 1

    Rear panel, one (1) Female XLR or 1/4 in combo connector, balanced, 0 / -55 dBu (line/mic) nominal input level adjustable, -30 / +21 dBu (line/mic) maximum input level, impedance 20k / 1k ohm (line/mic), phantom power +12 VDC

  • Audio Input 2

    Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100k ohm

  • Audio Processing

    Compression can be turned on/off, slope internally adjustable from 1:1 to 4:1, default 2:1

  • Contour

    Cuts and boosts frequencies above 5 kHz

  • Distortion

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

  • Audio Output

    Input 1 and input 2, mixed output (rear panel), two (2) phono connectors, unbalanced, -10 dBu nominal output level, +15 dBu maximum, impedance 10 ohm

  • Headphone Output

    Front panel, one (1) 3.5mm (0.14") stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 ohm

Transmitter: Controls

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  • User Controls

    Front Panel: Power, test tone on/off, channel up/down, input levels, mix level, contour, monitor volume controlRear Panel: Input 1 Level, (Line, Mic, Mic-Phantom Power), Input 2 level (-10 / +10 dBu), RF power level (low, mid, high)

  • Internal Adjustments

    Compression ratio for audio processor

  • Programming

    SQ on/off, process on/off, channel lock

Transmitter: Indicators

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  • LCD

    Channel designation, lock status, RF power level, programming (front panel)

  • Audio Input Status LEDs

    Indicates Input 1, Input 2, and Mix audio levels; 10 segment LED's (8 green, 2 red)

  • Processing

    Indicated by a green LED when on (front panel)

  • Test Tone

    Red LED illuminates when test tone is enabled.

  • RF Power

    Indicated on the LCD (low, mid, high)

Transmitter: RF

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  • Frequency Range

    72.025 - 75.950 MHz

  • Number of Channels

    17 wide band, 40 narrow band

  • Frequency Accuracy

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

  • Antenna Type

    Various antennas available

  • Transmitter Stability

    50 PPM

  • Transmission Range

    Up to 305 m (1,000 ft.)

  • Antenna Connector

    BNC

  • Output Power

    80,000 uV at 3 m

  • Number of Simultaneous Transmitters

    6

Transmitter: Power

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  • Power Supply

    In line power supply, Listen part number LA-207 (Line cord is determined by the each Country's AC power standards)

  • Power Supply Input

    100-240 VAC, 50-60 Hz, 0.4 A

  • Power Supply Output

    12 VDC, 1.3 A, 15.6 W

  • Power Supply Connector

    0.02" (5.0mm) OD, 0.01" (2.5mm) ID, barrel type

  • Compliance

    UL, CE, GS, TUV, RoHS

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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  • Safety

    RoHS

  • RF

    FCC Part 15, Part 90, Industry Canada

Transmitter: Physical

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  • Color

    Dark Gray with white silk screening

  • Rack Mounting

    One (1) rack space height, 1/2 rack space wide. One (1) or two (2) transmitters can be mounted in one rack space, optional rack mount (LA-326)

  • Compatibility

    LR-300-072, LA-125, LA-130, LA-326, LR-100-072, LR-400-072, LR-500-072, LA-277, LA-304, LR-4200-072, LR-5200-072-P1, LR-5200-072, LR-4200-072-P1, LP-40-072-01, LP-41-072-01, LP-50-072-01, LP-51-072-01, LA-303, LDS-5200-072, LDS-4200-072, LDS-4200-072-P0, LDS-4200-072-P1

  • Dimensions (W x H x D)

    8.50 x 1.7 x 9.13" (21.5 x 1.75 x 23cm)

  • Weight

    2.6 lb (1.2kg)
    with Power Supply: 3.5 lb (1.6kg)

Receiver: Audio

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  • System Distortion

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

  • Output/s

    Two (2) 3.5mm (0.14") connectors, unbalanced, 0 dBu nominal output level, 16 mW maximum, impedance 32 ohm

  • System Frequency Response

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

  • System Signal to Noise Ratio

    SQ enabled 80 dB, SQ disabled 60 dB

Receiver: Controls

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  • User Controls

    Power, up/down volume

  • Programming

    Via software and USB port

  • 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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  • LEDs

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

  • Display

    Channel designation, battery level, unit number, charging status

Receiver: RF

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  • Frequency Range

    72.0250 - 75.9500 MHz

  • Number of Channels

    17 wide band, 40 narrow band

  • Sensitivity

    .6uV typical, 1 uV maximum for 12 dB sinad

  • Frequency Accuracy

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

  • Squelch

    Programmable in 20 steps, automatic on loss of RF signal

  • Antenna Type

    Uses ear phone/neck loop lanyard and short ear phone cable or standard earphone cable

Receiver: Power

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  • Power Supply

    Micro USB connector, 5 V, 500 mA

  • Battery Type

    Lithium Ion 3.7 Vdc, 1200 mAh

  • Battery Life

    8 Hours of continuous 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, Part 90, Industry Canada, RoHS

Receiver: Physical

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  • Compatibility

    LT-800-072-01, LT-700-072

  • Color

    Black

  • Dimensions (H x W x D)

    Without Belt Clip: 3.75 x 2.00 x 0.64" (9.6 x 5 x 1.7cm)
    With Belt Clip: 3.75 x 2.00 x 0.80" (9.6 x 5.0 x 2.1cm)

  • Weight

    1.60 oz (45g)

About Listen Technologies LS-55-072

After careful design and engineering, the LS-55-072 Listen iDSP Prime Level III Stationary RF System emerges as an ideal solution for larger venues seeking extended range coverage. This comprehensive package includes the LT-800-072 RF Transmitter and a universal antenna kit, ensuring robust and reliable signal transmission across your venue.

The system comes complete with four LR-4200-072 iDSP RF receivers, providing high-performance assistive listening services from the get-go. These receivers are designed to deliver superior audio quality with a signal-to-noise ratio of 80 dB or greater and an audio frequency response of 50 Hz - 15 kHz ( +/-3 dB).

The LS-55 system also features the LA-381-01 Drop-in Charging/Dispensing Station, capable of charging, storing, and managing up to twelve receivers. This high-capacity station simplifies the process of expanding your RF system as your venue's demands increase.

To ensure legal compliance and visitor awareness, each LS-55 package includes an assistive listening notification signage kit. This kit informs all visitors about the availability of your assistive listening system.

The RF wireless assistive listening system is designed for use by the hearing-impaired, capable of broadcasting on 57 channels and being frequency agile. The device employs unique DSP SQ noise reduction technology and features a programmable squelch circuit.

The multi-functional display indicates battery status, inventory number, and channel, while the device can be worn via lanyard or belt clip. The lanyard option includes an integrated DSP driven neck loop that automatically senses and sends optimized audio signals directly to hearing aids and cochlear implants equipped with telecoils.

The device also includes a USB connector for inventory control, setup, charging, and firmware upgrades. It uses a non-proprietary lithium-ion battery and incorporates automatic battery charging circuitry.

The LS-55-072 Listen iDSP Prime Level III Stationary RF System is a product of Listen Technologies Corporation, a trusted name in the field of audio and video equipment.

Listen Technologies LS-55-072 Features

  • Advanced DSP SQTM noise reduction technology delivers 20 dB less noise and hiss than any other listening device
  • Integrated neck loop / lanyard with DSP loop driver improves the listening experience for T-coil users
  • Smallest device of its kind makes it easier to wear and for venues to dispense, store and maintain
  • Advanced green battery technology dramatically reduces costs of ownership and hassles while reducing the number of batteries in the landfill
  • Includes drop-in charging/dispensing station for streamlined dispensing, collecting and care of up to (12) iDSP RF listening devices
  • Ensures public venues deliver an exceptional listening experience while meeting new legislative requirements for assistive listening

Product Documents

User Manual

Key Features

  • Crystal-clear audio: The Listen iDSP system delivers exceptional sound quality.
  • Assistive listening system ensures everyone can comfortably hear presentations.
  • Easy to use: Set up the stationary RF transmitter quickly for seamless operation.
  • Includes 4 LR-4200-072 receivers with DSP for enhanced audio clarity.
  • Perfect for theaters: Improve accessibility with reliable audio solutions.
  • Long-lasting battery: Enjoy up to 8 hours of continuous use with the receivers.

What's in the box:

  • LT-800-072 Stationary RF Transmitter (72 MHz)
  • 4x LA-401 Universal Ear Speaker
  • 2x LA-430 Intelligent Earphone/Neck Loop Lanyard
  • LA-381-01 Intelligent 12-Unit Charging Tray
  • LPT-A107-B Dual RCA to Dual RCA Cable (6.6'/2m)
  • 4x LR-4200-072 Intelligent DSP RF Receiver (72 MHz)
  • (See Specification Section for Additional Included Items)
  • Listen Technologies Lifetime Limited Warranty