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Electronics > Audio > Professional Audio > Listen Technologies LS-91-01 ListenIR iDSP Level II System, North America; 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 audio channels with the choice of four mono carrier frequencies, 2.3, 2.8, 3.3 and 3.8 MHz; (LISTENTECHNOLIGIESLS9101 LISTENTECHNOLIGIES LS9101 LISTEN TECHNOLIGIES LS 91 01 LS-91-01)
Listen Technologies LS-91-01 ListenIR iDSP Level II System, North America; 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 audio channels with the choice of four mono carrier frequencies, 2.3, 2.8, 3.3 and 3.8 MHz; (LISTENTECHNOLIGIESLS9101 LISTENTECHNOLIGIES LS9101 LISTEN TECHNOLIGIES LS 91 01 LS-91-01)
Listen Technologies LS-91-01 ListenIR iDSP Level II System, North America; 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 audio channels with the choice of four mono carrier frequencies, 2.3, 2.8, 3.3 and 3.8 MHz; (LISTENTECHNOLIGIESLS9101 LISTENTECHNOLIGIES LS9101 LISTEN TECHNOLIGIES LS 91 01 LS-91-01)

SKU: LS9101

Brand: Listen Technologies

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Listen Technologies LS-91-01 ListenIR iDSP Level II System, North America; 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 audio channels with the choice of four 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 percent; The system shall have an audio frequency response of 63 Hz to 15 kHz, +/- 3db; The system shall have two independent mixing audio inputs, one for each transmission channel; Each mixing input shall consist of one 3.5 mm Microphone input, one balanced Phoenix type input and one 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 Expansion Radiators over CAT-5 cable for additional coverage; The system receivers shall be capable of receiving on four 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 3.5 mm (TRRS) connectors to drive the integrated neck loop lanyard or up to two 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; Weight 10 lbs

General Information
Manufacturer Listen Technologies
Manufacturer Part Number LS-91-01
Product Name ListenIR iDSP Level II System, North America
Overview
The LS-91 ListenIR iDSP Level II System from Listen Technologies comes complete with everything you need to begin transmitting audio and meeting assistive listening requirements

Ideal for small or medium-sized venues with a capacity of up to 50 seats, the LS-91 offers a convenient way to add secure assistive listening capabilities to boardrooms, courtrooms, theaters, educational spaces, and more. Each system includes one LT-84 Transmitter/Radiator combo, along with several LR-4200-IR iDSP receivers and a 12-unit charging tray. Packaged together, the LS-91 gives any business or venue a convenient way to achieve compliance with assistive listening regulations while giving your clients the highest level of audio performance
Features
  • 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 audio channels with the choice of four 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 percent
  • The system shall have an audio frequency response of 63 Hz to 15 kHz, +/- 3db
  • The system shall have two independent mixing audio inputs, one for each transmission channel
  • Each mixing input shall consist of one 3.5 mm Microphone input, one balanced Phoenix type input and one 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 Expansion Radiators over CAT-5 cable for additional coverage
  • The system receivers shall be capable of receiving on four 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 3.5 mm (TRRS) connectors to drive the integrated neck loop lanyard or up to two 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
  • Specification
    Includes
    One LT-84-01 ListenIR Transmitter/Radiator Combo
    Two LR-4200-IR Intelligent DSP IR Receiver
    Two LA-430 Intelligent Ear Phone/Neck Loop Lanyard
    Two LA-401 Universal Ear Speaker
    One LA-422 USB to Micro USB Cable
    One LA-381-01 Intelligent 12-Unit Charging Tray
    One LA-901 Listen Disinfecting Wipes (Cylinder 75 Count)
    ListenIR Transmitter/Radiator Combo
    Audio
    Frequency Response
    20 Hz - 20 kHz (+/- 1 dB Line Input
    63 Hz - 15 kHz (+/- 3 dB)
    System Specification (wireless end-to-end with LR-44)
    Signal-to-Noise Ratio
    More than 70 dB (SNR) Line Input
    More than 60 dB (SNR)
    System Specification (wireless end-to-end with LR-44)
    Microphone Input
    Two 3.5 mm Tip/Sleeve connector, -30 dBu nominal input, +14 dB headroom, impedance 4.4 Ohms, 5 VDC bias supply
    Total Harmonic Distortion
    Less than 0.1 percent (THD) Line Input
    Less than 2 percent
    System Specification (wireless end-to-end with LR-44)
    Unbalanced Line Input
    Sterreo/Mono Input
    Two Dual (RCA) Phono connectors, Unbalances, -10 dBu nominal input, +14 dB headroom, impedance 10 kOhms
    Balanced Line Input
    Mono Input. Two Phonix Type connector, balanced, +4 dB unominal input, +14 dB headroom, impedance 100 kOhms
    Controls
    Power Switch
    Three position Switch
    Power OFF
    Power ON - Indicator Lights OFF
    Power ON - Indicator Light ON
    Carrier Frequency Selection
    Two, four position rotary switches (2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz)
    Level Control Knob
    Two audio taper rotary potentiometer, counter-clockwise decreases input mix level, clockwise increases input mix level
    Indicators
    Power Supply LED
    Green LED on in-line power supply indicates AC power is applied
    Audio Level Indicators
    Two Green LEDs, Two 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
    RF
    Carrier Frequencies
    2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz, Selectable
    Number of Channels
    Two channels, Selectable carrier frequency
    Frequency Accuracy
    +/- 0.005 percent stability 0 to 50 degrees celsius
    Transmitter Stability
    50 PPM
    Modulation
    FM Wideband, +/- 50 kHz 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 presreve radiator life
    Expansion Link Output
    Two RJ-45 connectors - Provides RF Signal and Power, CAT-5e cable 24 AWG, 100 ft maximum cable length, two LA-141s per output connector
    IR
    Coverage Area
    30000 ft2 single channel with LR-4200-IR receivers
    IR Emitter Power
    1.49 W
    Power
    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 RJ-45 connectors providing Power and RF signal for uo to two LA-141 expansion radiators on each output
    Power Supply Type
    In-Line switching mode power supply
    Physical
    Mounting
    Can be mounted on a wall, ceiling, or table with provided hardware (screws and hollow wall anchors not provided)
    Environmental
    Temperature - Operation
    14 to +104 degrees fahrenheit
    Temperature - Storage
    -4 to +122 degrees fahrenheit
    Relative Humidity
    0 to 95 percent relative humidity, non-condensing
    Compliance
    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
    Intelligent DSP IR Receiver
    Audio
    System Distortion
    Less than total harmonic distortion (THD) at 80 percent deviation
    Audio Output Jacks
    Two 3.5 mm connectors, unbalanced, 0 dBu nominal output level, mW maximum, impedance 32 ohms, accepts mono or stereo phone plug or Intelligent Ear Phone/Neck Loop Lanyard
    System Frequency
    63 Hz - 15 kHz (+/- 3 dB)
    System Signal to Noise Ratio
    More than 60 dB
    Controls
    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
    Indicators
    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
    RF
    Carrier Frequencies
    2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz
    Number of Channels
    Four selectable channels
    Frequency Accuracy
    +/- 0.005 percent stability 32 to 122 degrees fahrenheit
    Modulation
    FM Wideband, +/- 50 kHz deviation max, 50 uS de-emphasis
    IR
    Coverage Area
    30000 ft2 single channel
    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 nW/cm2 at 40 dB SNR
    Power
    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
    Physical
    Color
    Flat Black
    Environmental
    Temperature - Operation
    14 to 104 degrees fahrenheit
    Temperature - Storage
    -4 to 122 degrees fahrenheit
    Relative Humidity
    0 to 95 percent relative humidity, non-condemsing
    Compliance
    Standards
    FCC Part 15, ICS-03, CE, RoHS, WEEE, ADA 706, CBC 11B-706
    Intelligent Ear Phone/Neck Loop Lanyard
    Interconnections
    Connection to Receiver
    Male to Male 3.5 mm (TRRS)
    Connection to Short Ear Phone
    Female 3.5 mm (TRS)
    Loop
    Neck Loop Field Strength
    400 mA/m (+/- 3 dB)
    Neck Loop Frequency Response
    100 Hz to 5 kHz (+/- 3 dB ref 1 kHz)
    Physical
    Color
    Black
    Compliance
    Standards
    RoHS, IEC60118-4
    Universal Ear Speaker
    Audio
    Frequency Response
    20 Hz - 20  kHz
    Impedance
    32 Ohms +/- 15 percent at 1 kHz
    Input Sensitivity
    115 dB +/- 4 dB at 1 kHz, 1 mW
    Rated Power Input
    50 mW
    Max Power Input
    100 mW
    Interconnections
    Connector/s
    Male 3.5 mm (TRS)
    Physical
    Color
    Dark Gray
    Cable Length
    13", extension cable is 28"
    Compliance
    Standards
    RoHS
    USB to Micro USB Cable
    Interconections
    Connector/s
    USB (type A to Micro USB (micro-B))
    Physical
    Color
    Black
    Intelligent 12-Unit Charging Tray
    Power
    Power Supply Input
    100 - 240 VAC
    50 - 60 Hz
    Power Supply Output
    5.0 VDC
    8 A
    40 W
    Power Supply Connector
    0.22" OD x 0.09" ID, barrel type
    Cord
    72" Input Power Cord, 45"Output Cord
    Physical
    Color
    Black
    Compliance
    Standards
    UL, CE, RoHS
    Listen Disinfecting Wipes (Cylinder 75 Count)
    Physical
    Sheet Size
    7" x 8"
    Weight and Dimensions
    Weight
    10 lbs
    A-20190112-1831-200-L
    *This item is BRAND NEW - not refurbished. It comes with all manufacturer supplied accessories; and full manufacturer's USA warranty.
    *** DISCLAIMERS: 1) Availability is not always guaranteed: Please call or email us to double-check stock before placing your order. We ship from our inventory and also drop-ship from hundreds of suppliers. We try very hard to show only available products but sometimes products sell out before we can update the product webpage.  2) Some information may have been supplied by 3rd Party Content Suppliers: We are not responsible for Data or Image errors.  3) We do not offer Installation, Training or Technical Support on this product.***

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