• Listen Technologies LS-90-0 ListenIR iDSP Level I System
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Listen Technologies ListenIR iDSP Assistive Listening System Pre-Configured IR Kit Level I | Standard

Listen Technologies ListenIR iDSP Assistive Listening System Pre-Configured IR Kit Level I | Standard

SoundPro Item: 72712 | Part Number: LS-90-01

$1,522.00
$1,691.00 $1,522.00
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MSRP: $1,691.00 | MAP: $1,522.00

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  • Pre-Configured Package Eliminates Field Programming And Reduces Installation Labor
  • Infrared Transmission Prevents Eavesdropping And Eliminates Crosstalk Between Adjacent Spaces
  • Intelligent DSP Processing Maintains Audio Clarity Across The Entire Coverage Area
  • Integrated Neck Loop Lanyards Enable Direct Coupling With Telecoil-Equipped Hearing Devices
  • Four-Port USB Charging Station Ensures Receiver Readiness Without Dedicated Charging Infrastructure
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The ListenIR iDSP Level I System delivers turnkey assistive listening compliance for boardrooms, training facilities, courtrooms, and small theaters seating up to 50 occupants. Built around the LT-84 Transmitter/Radiator Combo, this package transmits clear infrared audio across 2,787 square meters without interference from RF sources or adjacent rooms. LR-4200-IR intelligent DSP receivers decode the signal with precision, while integrated neck loop lanyards ensure compatibility with T-coil hearing aids and cochlear implants.

Designed for single-channel applications, the system requires no custom programming or complex setup. The LA-423 4-port USB charger keeps receivers ready between events, and universal ear speakers provide immediate use for guests without telecoil-equipped devices. Integrators gain predictable coverage, venue managers achieve ADA compliance, and end users experience intelligible audio free from dropout or ambient noise intrusion.

Where competing systems require additional radiators or signal boosters to cover mid-sized spaces, this configuration provides complete coverage from a single transmitter position. The result is lower installed cost, simplified commissioning, and reliable performance across worship spaces, municipal facilities, and corporate environments.

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Specifications

Certifications
Standards
FCC part 15, ICS-03, CE, UL, CUL, C-Tick, CCC, PSE, KC, GS, RoHS
WEEEPower Supply Compliance Marks
CUL, UL, CE, CCC, C-Tick, KC, PSE, GS, FCC, RoHS
Compliance Standards
FCC Part 15, ICS-03, CE, RoHS, WEEE, ADA 706, CBC 11B-706
Dimensions
Dimensions (HxWxD)
1.5x10.7x4.1" (3.81x27.2x10.5cm)Unit
Dimensions Hard Plaque
7x10” (178x254 mm)
Weight
Weight with Power Supply
1.8 lbs (0.8 kg)Shipping
BlackUnit Weight with Batteries
2.8 oz. (79.4 g)Shipping
Shipping Weight
1 lb (0.5 kg)
Electrical
Indicators Power Supply LED
Green LED on in-line power supply indicates AC power is appliedAudio
Power Power Supply Input
100-240 VAC, 50-60
Power Power Supply
Micro USB connector, 5 V, 500 mABattery Type: Lithium IonBattery Life: 8 Hours of typical useBattery Charging Time: Fully charged in 2.5 Hours
Audio
Channel Configuration
Single-channel
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
Output
Two (2) RJ-45 connectors. providing Power and RF signal for up to two (2) LA-141 expansion radiators on each outputPower
Operation
14°F (-10°C) to +104°F (40°C)Temperature -
Audio System Distortion
< 2% total harmonic distortion (THD) at 80% deviationAudio
Loop LanyardSystem Frequency Response
63 Hz - 15 kHz (±3 dB)System
Signal to Noise Ratio
> 60 dB
Neck Loop Field Strength
400 mA/m (+/- 3dB)Neck
Loop Frequency Response
100Hz to 5kHz (+/- 3 dB ref 1kHz)
Sensitivity
115 dB +/- 4dB @ 1 kHz, 1 mWRated
Connectivity
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 supplyTotal
LR-4200)Unbalanced Line Input
Stereo/Mono Input. Two (2) Dual (RCA) Phono connectors, unbalanced, -10 dBu nominal input, +14 dB headroom, impedance 10k
OhmsBalanced Line Input
Mono Input. Two (2) Phoenix Type connector, balanced, + 4 dBu nominal input, +14 dB headroom, impedance 100k Ohms
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
HzPower Supply Output
12 VDC, 4 A, 48
WPower Supply Connector
2.5 mm ID barrel connector, center positivePower
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
Power Input
50 mWMax
APower Supply Output
5.0 VDC, 4.2 A
Construction
Physical Color
Black with White Silk ScreeningUnit
Controls
Indicators Display
OLED - Channel designation, battery level, unit number, charging status, volume statusLED: Flashes when batteries are low or to indicate charging, solid when fully charged
Included Items
Transmitter/Radiator Combo
One (1) LT-84-01
iDSP IR Receiver
Two (2) LR-4200-IR
Neck Loop Lanyard
Two (2) LA-430
Ear Speaker
Two (2) LA-401 Universal
USB Charger
One (1) LA-423 4-Port
Environmental
Humidity
0 to 95% relative humidity, non-condensing
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.
General
Harmonic Distortion
< 0.1% (THD) Line Input, < 2% (THD) System Specification (wireless end-to-end with
Controls Power Switch
Three (3) position switch - Power OFF, Power ON-Indicator Lights OFF, Power ON-Indicator
Lights ONCarrier 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
Level Indicators
Two (2) Green LEDs, two (2) Red LEDs, Green LED indicates Audio presence and Red LED indicates peaks in the audioRJ-45
Amber LED
Solid Amber indicates carrier is present and IR is being transmittedRJ-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
SelectableNumber of Channels
Two (2) channels
Selectable Carrier Frequencyfrequency Accuracy
+/- .005% stability 0 to 50 °CTransmitter
Stability
50
PPMModulation
FM Wideband, ±50kHz deviation max, 50 ?S pre-emphasisPower
Save Mode
Carrier will shut off when no audio is present for 15 minutes on both channels to preserve radiator lifeExpansion
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 receiversIR Emitter Power
1.49W
LA-210Power 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)
Storage
-4°F (-20°C) to +122°F (50°C)Relative
LT-84 Transmitter/Radiator
Compliance
Controls User Controls
Power on/off and volume up/downProgramming: Via software and USB port, Auto Seek, Jack Sense, Squelch, Auto Power, Auto Off, Stereo, Brightness
Channel NameSet-up Controls
Press and hold up/down volume buttons for 5 seconds to enterchannel adjust, use up/down to select channel
MHzNumber of Channels
Four (4) selectable channelsFrequency
Accuracy
± .005% stability 32 to 122 ºF (0 to 50 ºC)Modulation: FM Wideband, ±50 kHz deviation max, 50 uS de-emphasis
LT-82/LA-140Squelch
Programmable in 20 steps, automatic on loss of
IR Signalpower Save Mode
Turns unit off after a specified time of no IR signal, default is 30 minutesSensitivity: Better than one (1) nW/cm2 @40 dB SNR
Belt Clip
3.75x2x0.8" (9.6x5x2.1cm)
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)
Interconnections
Male 3.5 mm (TRS)
LA-304 Signage Kit
Weight 6 oz. (170 g)
Soft Cling
7x10” (178x254 mm)
Coverage
Maximum Area
2,787 m² (30,000 ft²)
Venue Capacity
Up to 50 seats
Power
Supply Type
In-line switching mode power supply, Listen part number

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