Securely transmit assistive listening audio and ensure compliance for your venue with the LS-90-0 ListenIR iDSP Level I System. The pre-configured system includes everything you need to meet the needs of a small or mid-size venue up to 50 seats, including boardrooms, theaters, training venues, classrooms, and more.

Each LS-90-0 system comes complete with one of our LT-84 Transmitter/Radiator combos for clear and secure line-of-sight audio transmission, along with our LR-4200-IR receivers and LA-423 4-port charger.

Simple to set up and cost effective, the LS-90-0 from Listen Technologies offers better coverage than similar systems at an affordable price.

Listen Technologies LS-90-0 ListenIR iDSP Level I Features

Pre-configured infrared system comes with everything you need to begin offering secure, high-quality assistive listening in your venue
Provides outstanding coverage up to 2,787 m2 (30,000 ft2)
Ideal for small or medium-sized venues up to 50 seats
Simple to set up and easy to use
Crystal clear audio performance for all listeners
Integrated neck loops/lanyards provide compatibility with T-coil-equipped devices
Designed for single-channel applications

LT-84-01 ListenIR Transmitter/Radiator Combo1
LR-4200-IR Intelligent DSP IR Receiver2
LA-430 Intelligent Ear Phone/Neck Loop Lanyard2
LA-401 Universal Ear Speaker2
LA-423 4-Port USB Charger1
LA-304 Assistive Listening Notification Signage Kit1

LT-84 Transmitter/Radiator
- 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-4200)
  - Signal-to-Noise Ratio: > 70 dB (SNR) Line Input, > 60 dB (SNR) System Specification (wireless end-to-end with LR-4200)
  - 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-4200)
  - 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 dBu nominal input, +14 dB headroom, impedance 100k Ohms
- Controls
  - 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
- Indicators
  - 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
- RF
  - 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 °C
  - Transmitter Stability: 50 PPM
  - Modulation: FM Wideband, ±50kHz deviation max, 50 ?S 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
- IR
  - Coverage Area: 2,787 m² (30,000 ft²) single channel with LR-4200-IR/LR-5200-IR receivers or 697 m² (7,500 ft²) single channel with LR-42/LR-44 receivers
  - IR Emitter Power: 1.49W
- 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 (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 F (LT-84-03), Australia Type I (LT-84-04)
- Physical
  - Color: Black with White Silk Screening
  - Unit Weight with Power Supply: 1.8 lbs (0.8 kg)
  - Shipping Weight: 3.4 lbs (1.54 kg)
  - Mounting: 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.
  - Dimensions (HxWxD): 1.5x10.7x4.1" (3.81x27.2x10.5cm)
  - Unit Weight: 0.8 lbs (0.4 kg)
- Environmental
  - Temperature - Operation: 14°F (-10°C) to +104°F (40°C)
  - Temperature - Storage: -4°F (-20°C) to +122°F (50°C)
  - Relative Humidity: 0 to 95% 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
LR-4200-IR Intelligent DSP IR Receiver
- Audio
  - System Distortion: < 2% total harmonic distortion (THD) at 80% deviation
  - Audio Output Jacks: Two (2) 3.5 mm (0.14") 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
- 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 (4) selectable channels
  - Frequency Accuracy: ± .005% stability 32 to 122 ºF (0 to 50 ºC)
  - Modulation: FM Wideband, ±50 kHz deviation max, 50 uS de-emphasis
- IR
  - Coverage Area: 30,000 ft² (2787 m²) single channel with LT-84/LA-141 or 40,000 ft² (3716 m²) 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
- 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
  - Unit Weight with Batteries: 2.8 oz. (79.4 g)
  - Shipping Weight: 3.5 oz. (99.2 g) with a 1 lbs. (0.45 kg) minimum
  - Dimensions (HxWxD): 3.75x2x0.64" (9.6x5x1.7cm)
  - Unit Weight: 1.9 oz. (53.9g)
  - Dimensions with Belt Clip: 3.75x2x0.8" (9.6x5x2.1cm)
- Environmental
  - Temperature - Operation: 14 to 104ºF (-10 to 40ºC)
  - Temperature - Storage: (-)4 to 122°F (-20 to 50°C)
  - Relative Humidity: 0 to 95% relative humidity, non-condensing
- Compliance Standards: FCC Part 15, ICS-03, CE, RoHS, WEEE, ADA 706, CBC 11B-706
LA-430 Integrated Neck Loop
- Interconnections
  - Connection to Receiver: Male 3.5 mm (TRRS) to Male 3.5 mm (TRRS)
  - Connection to Short Ear Phone: Female 3.5 mm (TRS)
- Loop
  - Neck Loop Field Strength: 400 mA/m (+/- 3dB)
  - Neck Loop Frequency Response: 100Hz to 5kHz (+/- 3 dB ref 1kHz)
- Physical
  - Color: Black
  - Shipping Weight: 1 lbs. (454 g)
  - Cord Length: 29" (74 cm)
  - Unit Weight: 1.5 oz. (43 g)
- Compliance Standards: RoHS, IEC60118-4
LA-401 Universal Ear Speaker
- Audio
  - Frequency Response: 20 Hz - 20 kHz
  - Impedance: 32 ohm +/- 15% @ 1 kHz
  - Input Sensitivity: 115 dB +/- 4dB @ 1 kHz, 1 mW
  - Rated Power Input: 50 mW
  - Max Power Input: 100 mW
- Interconnections: Male 3.5 mm (TRS)
- Physical
  - Color: Dark Gray
  - Shipping Weight: 1 lbs (454g)
  - Cable Length: 13" (33cm), extension cable is 28" (71 cm)
  - Unit Weight: 0.4 oz (11g)
- Compliance Standards: RoHS
LA-423 USB Charger
- Power
  - Power Supply Input: 100-240 V, 50-60 Hz, 0.5 A
  - Power Supply Output: 5.0 VDC, 4.2 A
- Physical
  - Color: Black
  - Shipping Weight: 1 lbs. (454g)
  - Cable Length: 36" (92cm)
  - Cable Type: 4 - USB to Micro USB Cables (LA-422)
  - Dimensions (HxWxD): 2.44x2.9x1.13" (62x74x29mm)
  - Unit Weight: 7.8 oz (221g)
- Compliance Standards: UL, FCC, RoHS, CE. RCM
LA-304 Signage Kit
- Shipping Weight: 1 lb (0.5 kg)
- Weight 6 oz. (170 g)
- Dimensions Hard Plaque: 7x10” (178x254 mm); Soft Cling: 7x10” (178x254 mm)