Listen Technologies LS-31 Listen IDSP Essentials Level 2 Stationary RF System, Includes LT-803-072-01 3-Channel RF Transmitter, 72 MHz

SKU: LTLS31072 MFR: LS-31-072
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Key Features

  • Crystal-clear audio: Experience superior sound quality with this Listen Technologies system.
  • Assistive listening: Ideal for theaters, classrooms, & houses of worship needing audio solutions.
  • Easy setup: Get your Listen Technologies system running quickly with included quick reference guide.
  • Long battery life: Enjoy up to 24 hours of continuous use with the DSP RF receiver.
  • Versatile connectivity: Connect various audio sources via XLR, phono, and 3.5 mm inputs.
  • Complete system: Includes transmitter, receivers, ear speakers, and essential accessories.
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Special Order?Estimated to Ship: 08/18/2025
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Listen Technologies LS-31 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 Antenna (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
    Hard Plaque
    Static Cling Window Sticker

  • 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 + Quick Reference Card)
    LPT-A107-B Dual RCA to Dual RCA Cable 6.6' - Stereo 3.5 mm to Dual RCA 6.6' - Dual RCA to Dual RCA 6.6' - Stereo 3.5 mm to Stereo 3.5 mm 19.67" - Two 3.5mm to one Euro Connector 6.6'

RF Transmitter: Audio

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  • Frequency Response

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

  • Signal-to-Noise Ratio

    62 dB (A-Weighted)

  • Audio

    Input 1: Rear panel, one (1) Female XLR and 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
    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) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 ohm

RF 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

    Process on/off, channel lock

RF Transmitter: Indicators

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  • LCD

    Channel Designation, lock status, RF power level (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)

RF Transmitter: RF

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  • Frequency Range

    (A) 72.100, (E) 72.900, (H) 75.900

  • Number of Channels

    3 wide band

  • Frequency Accuracy

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

  • 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

RF 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)
    Input: 100-240 VAC, 50-60 Hz, 0.4 A
    Output: 12 VDC, 1.3 A, 15.6 W

  • Power Supply Connector

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

  • Compliance

    UL, CE, GS, TV, RoHS

RF Transmitter: Environmental

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  • Temperature

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

  • Relative Humidity

    0 to 95% relative humidity, non condensing

RF Transmitter: Compliance

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  • RF

    FCC Part 15, Part 90, Industry Canada

RF Transmitter: Physical

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  • Color

    Dark Gray with white silk screening

  • Compatibility

    Remote Antenna Kit 25 ft. (7.6 m)
    Standard 3-Channel RF Receiver (72 MHz)

  • 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)

  • Dimensions (W x H x D)

    8.50 x 1.75 x 9.13" (21.5 x 4.5 x 23cm)

  • Weight

    Without Power Supply: 2.6 lb (1.2kg)
    With Power Supply: 4.5 lb (2kg)

Antenna Kit: Interconnections

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  • Connector/s

    BNC

Antenna Kit: RF

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  • Frequency Range

    72 MHz - 72.025 MHz - 75.975 MHz216 MHz - 216.0125 MHz - 216.9875 MHz

  • Number of Channels

    72 MHz - 57 (17 wide band, 40 narrow band)216 MHz - 57 (19 wide band, 38 narrow band)

  • Antenna Type

    Monopole and Dipole

  • Unity Gain

    0 dB

  • Typical Range

    Range up to 305 m / 1,000 ft @72 MHz, 914 m / 3,000 ft @216 MHz.

Antenna Kit: Physical

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  • Mounting

    Wall mount, dual and single electrical box, ceiling electrical box, horizontal surface mount (such as on top of a rack), ceiling/inverse mounting, flexible mounting in-wall or in ceiling and mast or conduit mount.
    Includes self-tapping sheet metal screws, drywall anchors, and all hardware required to mount to electrical boxes. Does not provide hardware required to mount to a mast (available at most hardware satores).

  • Compatibility

    Stationary RF Transmitter (72 MHz)
    Stationary 3-Channel RF Transmitter (72 MHz)

  • Dipole Vertical Length

    72 MHz: 80" (203.2cm), 216 MHz: 27" (68.6cm)

  • Dimensions

    Bracket (W x D x H): 4.5 x 7.0 x 2.5" (11 x 18 x 6.4cm)
    Grounding Base (W x D x H): 8.0 x 8.0 x 2.0" (20.4 x 20.4 x 5.1cm)
    Mounting Plate: 4.48 x 4.55" (11.4 x 11.6cm)

  • Weight

    4.4 lb (2.0kg)

Rack Mounting Kit: Physical

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  • Dimensions (H x W x D)

    Rack Mount: 19.0 x 1.75 x 8.0" (48.3 x 4.4 x 20.3cm)

  • Weight

    4.4 lb (2.0kg)

DSP RF Receiver: Audio

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  • System Distortion

    < 1% total harmonic distortion (THD) at 80% deviation

  • Output/s

    Two (2) 3.5 mm (0.14 in.) connectors, unbalanced, 0 dBu nominal output level, 50 mW maximum, impedance 32 ohm

  • System Frequency Response

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

  • System Signal to Noise Ratio

    SQ disabled 70 dB, SQ enabled 80 dB

DSP RF 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

DSP RF Receiver: Indicators

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  • LEDs

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

DSP RF Receiver: RF

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  • Frequency Range

    72.0250 - 75.9500 MHz

  • Number of Channels

    Basic Mode: 3 wide Band, Expand Mode: 17 wide 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

    Fixed level, automatic on loss of RF signal

  • Antenna Type

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

DSP RF Receiver: Power

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  • Battery Type

    Lithium Ion 3.7 Vdc, 1200 mAh

  • Battery Life

    24 Hours of continuous use

  • Battery Charging Time

    Fully charged in 2.5 Hours

  • Power Supply

    Micro USB connector, 5 V, 500 mA

DSP RF Receiver: Environmental

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  • Temperature

    Operation: 14 to 104 Degree F (-10 to 40 Degree C)
    Storage: -4 to 122 Degree F (-20 to 50 Degree C)

  • Relative Humidity

    0 to 95% relative humidity, non-condensing

DSP RF Receiver: Compliance

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  • Standards

    FCC Part 15 Class B, Industry Canada ICES-3 (B), RoHS

DSP RF Receiver: Physical

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  • Color

    Black

  • Compatibility

    Stationary RF Transmitter (72 MHz)
    Portable Display RF Transmitter (72 MHz)
    Stationary 3-Channel RF Transmitter (72 MHz)

  • 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

    Without Batteries: 2.40 oz (68g)
    With Batteries: 1.60 oz (45g)

Ear Speaker

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  • Frequency Response

    20 Hz - 20 kHz

  • Impedance

    32 ohm +/- 15% @ 1 kHz

  • Input Sensitivity

    115 dB +/- 4dB @ 1 kHz, 1 mW

  • Power Input

    Rated: 50 mW
    Max: 100 mW

  • Connector/s

    Male 3.5 mm (TRS)

  • Standards

    RoHS

  • Color

    Dark Gray

  • Compatibility

    Portable Digital RF Receiver (72 MHz)
    IR Lanyard 4-Channel Receiver
    Standard 3-Channel RF Receiver (72 MHz)
    Portable Display RF Receiver (72 MHz)
    Intelligent DSP IR Receiver
    Advanced Intelligent DSP IR Receiver

  • Cable Length

    13" (33cm), extension cable is 28" (71cm)

  • Weight

    0.40 oz (11g)

Loop Lanyard

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  • Connection to Receiver

    Male 3.5 mm (TRRS) to Male 3.5 mm (TRRS)

  • Connection to Short Ear Phone

    Female 3.5 mm (TRS)

  • Neck Loop Field Strength

    400 mA/m (+/- 3dB)

  • Neck Loop Frequency Response

    100Hz to 5kHz (+/- 3 dB ref 1kHz)

  • Standards

    RoHS, IEC60118-4

  • Color

    Black

  • Cord Length

    29" (74cm)

  • Weight

    1.50 oz (43g)

Audio Cable Kit

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  • Cable Length

    Stereo 3.5 mm to Dual RCA: 6.6" (2m)
    Dual RCA to Dual RCA: 6.6" (2m)
    Stereo 3.5 mm to Stereo 3.5 mm: 19.67" (50cm)
    Two (2) 3.5 mm to one (1) Euro Connector: 6.6" (2m)

  • Weight

    1 lb (454g)

USB Charger

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  • Power Supply

    Input: 100-240 V, 50-60 Hz, 0.5 A
    Output: 5.0 VDC, 4.2 A

  • Standards

    UL, FCC, RoHS

  • Color

    Black

  • Compatibility

    USB to Micro USB Cable

  • Cable Length

    36" (92cm)

  • Cable Type

    4 - USB to Micro USB Cables (LA-422)

  • Dimensions (H x W x D)

    2.44 x 2.90 x 1.13" (62 x 74 x 29mm)

  • Weight

    7.80 oz (221g)

Signage Kit

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  • Compatibility

    Stationary RF Transmitter (72 MHz)
    Stationary 3-Channel RF Transmitter (72 MHz)
    ListenIR 1-Channel Transmitter
    Portable Display RF Transmitter (72 MHz)
    Portable Display RF Transmitter (216 MHz)

  • Dimensions

    Hard Plaque: 7 x 10" (178 x 254mm)
    Soft Cling: 7 x 10" (178 x 254mm)

  • Weight

    6 oz (170g)

About Listen Technologies LS-31

Before you invest in a stationary RF system, consider the advanced LS-31 Listen IDSP Essentials Level 2 Stationary RF System. This high-quality, durable product from the reputable brand, Listen Technologies, is designed to enhance your listening centers with its innovative features and comprehensive package.

The LS-31 system includes the LT-803-072-01 3-Channel RF Transmitter, operating at a frequency of 72 MHz. This transmitter ensures clear communication across various settings, making it an ideal choice for businesses or venues requiring one to three channels of assistive listening audio. With universal inputs, it can accommodate nearly any audio source, including mixers, microphones, and MP3 players.

The system also boasts a Look & Listen LCD display for immediate information about channel, lock, and RF power. The digital tuning feature guarantees that the included receivers won't drift off channel, ensuring a strong connection for an enjoyable listening experience.

The package also includes the LA-122 Universal Antenna Kit, suitable for both 72 MHz and 216 MHz systems. This kit comes with all the necessary components to configure several versions of the antenna, and a 25-foot coaxial cable.

The LA-326 Universal Rack Mounting Kit allows for the installation of Listen Technologies' LT-800, LT-803, LT-82, and LR-100 in a standard audio rack. This kit is capable of single or dual-unit mounting, offering flexibility in setup.

The LR-3200-072 Basic DSP RF Receiver, part of our Intelligent Digital Signal Processing (iDSP) line, offers outstanding audio clarity and quality with the best range and reception in its class. This compact unit is equipped with a micro USB connection which can be used with free iDSP software for charging, set up, programming, inventory management, and firmware updates.

The LA-401 Universal Ear Speaker, featuring a comfortable, over-the-ear design, offers high-quality audio performance and freedom of movement. It can be used with hearing aids for a truly universal solution.

The LA-430 Intelligent Ear Phone/Neck Loop Lanyard incorporates an advanced DSP loop driver for an outstanding listening experience, making it easy for your venue or business to meet the legal requirements for assistive listening systems while offering customers and clients an enhanced audio experience.

The LPT-A107 Audio Cable Kit provides multiple cables which are typically used to connect most audio sources to the control unit. The LA-423 4-Port USB Charger offers an easy way to simultaneously charge up to four Listen iDSP products.

Lastly, the LA-304 Assistive Listening Notification Signage Kit helps you achieve compliance with assistive listening regulations while also ensuring that visitors know about your system's availability.

In conclusion, the LS-31 Listen IDSP Essentials Level 2 Stationary RF System is a comprehensive, high-quality solution for your listening center needs.

Listen Technologies LS-31 Features

  • Low priced solution for meeting your installed assistive listening needs
  • Three (3) frequencies makes it simple to install, manage and use
  • 100 % Digital - Listen receivers are digitally-tuned so the transmission won't drift
  • Long transmission range ensures coverage for the entire venue

Product Documents

User Manual

Key Features

  • Crystal-clear audio: Experience superior sound quality with this Listen Technologies system.
  • Assistive listening: Ideal for theaters, classrooms, & houses of worship needing audio solutions.
  • Easy setup: Get your Listen Technologies system running quickly with included quick reference guide.
  • Long battery life: Enjoy up to 24 hours of continuous use with the DSP RF receiver.
  • Versatile connectivity: Connect various audio sources via XLR, phono, and 3.5 mm inputs.
  • Complete system: Includes transmitter, receivers, ear speakers, and essential accessories.

What's in the box:

  • LT-803-072-01 3-Channel RF Transmitter (72 MHz)
  • Power Supply
  • Quick Reference Card
  • 4x LR-3200-072 Intelligent DSP RF Receiver (72 MHz)
  • 4x LA-401 Universal Ear Speaker
  • 4x LA-434 Earphone Extension Cable
  • 2x LA-430 Intelligent Ear Phone/Neck Loop Lanyard
  • LA-423-01 4-Port USB Charger
  • 4x LA-422 USB to Micro USB Cable
  • (See Specification Section for Additional Included Items)
  • Listen Technologies 5 Year Limited Warranty