High-performance infrared audio transmitter with dual selectable carrier frequencies and wideband FM modulation for clear, reliable assistive listening coverage up to 30,000 sq. ft.
The Listen Technologies LS-96T-01 ListenIR TAA Advanced iDSP System is engineered for precise infrared audio transmission, supporting two independent channels with selectable carrier frequencies of 2.3, 2.8, 3.3, and 3.8 MHz. It delivers excellent audio fidelity with a frequency response of 20 Hz to 20 kHz on line input and 63 Hz to 15 kHz across the system when paired with LR-4200 receivers. This system features two microphone inputs with 3.5 mm tip/sleeve connectors, offering a nominal input sensitivity of -30 dBu and 5 VDC bias supply.
Audio quality is maintained with a signal-to-noise ratio greater than 70 dB on line input and total harmonic distortion under 0.1%. Controls include a three-position power switch, dual four-position rotary carrier frequency selectors, and audio level potentiometers for precise mixing. Status indicators provide real-time feedback on power, audio levels, and IR transmission. The transmitter includes a power save mode that disables carriers after 15 minutes of silence to extend component life.
Infrared coverage reaches up to 30,000 square feet with compatible receivers. Power is supplied via an in-line switching mode supply with 100–240 VAC input and 12 VDC output. Compact and lightweight, the unit measures 1.5 x 10.7 x 4.1 inches and weighs 0.8 pounds.
Two 3.5 mm microphone inputs with 5 VDC bias supply
Signal-to-noise ratio: >70 dB (line input), >60 dB (system)
Total harmonic distortion: <0.1% (line input)
Power save mode disables carrier after 15 minutes of no audio
Infrared coverage up to 30,000 sq. ft. with compatible receivers
Compact dimensions: 1.5 x 10.7 x 4.1 inches; weight: 0.8 lb
Specifications
Audio
Frequency Response: 20 Hz to 20 kHz (±1 dB) Line Input, 63 Hz to 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 3.5 mm Tip/Sleeve Connector, -30 dBu Nominal Input, +14 dB Headroom, Impedance 4.4 Kilohms, 5 VDC Bias Supply Total Harmonic Distortion: < 0.1% (THD) Line Input, < 2% (THD) System Specification (Wireless End-to-End with LR-4
Controls
Power Switch: 3 x Position Switch - Power Off, Power On - Indicator Lights Off, Power On - Indicator Lights On Carrier Frequency Selection: 2 x Four Position Rotary Switches (2.3, 2.8, 3.3, 3.8 MHz) Level Control Knob: 2 x Audio Taper Rotary Potentiometers, Counterclockwise Decreases Input Mix Level, Clockwise Increases Input Mix Level
Dimensions (H x W x D)
1.5 x 10.7 x 4.1" / 3.81 x 27.2 x 10.5 cm
Indicators
Power Supply LED: Green LED on In-Line Power Supply Indicates AC Power is Applied Audio Level Indicators: 2 x Green LEDs, 2 x 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
IR
Coverage Area:30,000 ft² Single Channel with LR-4200-IR/LR-5200-IR Receivers or 7500 ft² Single Channel with LR-42/LR-44 Receivers IR Emitter Power: 1.49 W
Power
Power Supply Input: 100 to 240 VAC, 50 to 60 Hz Power Supply Output: 12 VDC, 4 A, 48 W Power Supply Connector:2.5 mm ID Barrel Connector, Center Positive Power Output: 2 x RJ-45 Connectors. Providing Power and RF Signal for up to 2 x 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)
RF
Carrier Frequencies: 2.3, 2.8, 3.3, 3.8 MHz, Selectable Number of Channels: 2 x Channels, Selectable Carrier Frequency Frequency Accuracy: ± .005% Stability 0 to 50°C Transmitter Stability: 50 PPM Modulation: FM Wideband, ±50 kHz Deviation Max Power Save Mode: Carrier Will Shut Off When No Audio Is Present for 15 Minutes on Both Channels to Preserve Radiator Life
