The Listen LR-4200-072 Intelligent DSP RF Receiver delivers outstanding audio clarity and best-in-class range in a compact, easy-to-wear design. Part of Listen Technologies’ iDSP line, this small yet powerful receiver integrates a neck loop/lanyard and DSP loop driver for enhanced listening with T-coil-equipped hearing aids. Dual 3.5mm outputs allow sharing between users, while an OLED display provides clear readouts of battery status, channel selection, and volume level.
Equipped with advanced Lithium-ion rechargeable batteries, the LR-4200-072 ensures long-lasting power for extended sessions, while a micro USB connection allows charging, setup, programming, inventory management, and firmware updates via free iDSP software. Ideal for classrooms, conferences, boardrooms, and other venues, this receiver is compact, convenient, and reliable for assistive listening applications.
LISTEN LR-4200-072 Highlights
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High-performance RF receiver with best-in-class sensitivity and 20dB lower noise
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Integrated neck loop/lanyard with DSP loop driver for T-coil listening
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Small, lightweight design for ease of wear, storage, and dispensing
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OLED display shows battery, channel, and volume information
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Optional lanyard or belt clip for discreet, convenient use
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Advanced Lithium-ion rechargeable battery technology
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Designed for single-channel applications
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Dual 3.5mm outputs for sharing
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LISTEN LR-4200-072 Includes
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One (1) LR-4200-072 Intelligent DSP RF Receiver (72 MHz)
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Quick start guide
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Non-proprietary, field-replaceable Lithium-ion battery
LISTEN LR-4200-72 Specifications
+Audio
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System Distortion
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< 2% total harmonic distortion (THD) at 80% deviation
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Output/s
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Two (2) 3.5 mm (0.14 in.) connectors, unbalanced, 0 dBu nominal output level, 16 mW maximum, impedance 32 ohm
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System Frequency Response
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50 Hz - 15 kHz (±3 dB)
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System Signal to Noise Ratio
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SQ enabled 80 dB, SQ disabled 60 dB
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+Controls
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User Controls
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Power, up/down volume
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Programming
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Via software and USB port
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Set-up Controls
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Press and hold up/down volume buttons for 5 seconds to enter channel adjust, use up/down to select channel
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+Indicators
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LEDs
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Flashes when batteries are low or to indicate charging, solid when fully charged
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Display
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Channel designation, battery level, unit number, charging status
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+RF
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Frequency Range
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72.0250 - 75.9500 MHz
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Number of Channels
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17 wide band, 40 narrow band
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Sensitivity
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.6uV typical, 1 uV maximum for 12 dB sinad
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Frequency Accuracy
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± .005% stability 32 to 122 ºF (0 to 50 ºC)
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Squelch
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Programmable in 20 steps, automatic on loss of RF signal
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Antenna Type
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Uses ear phone/neck loop lanyard and short ear phone cable or standard earphone cable
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+Power
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Power Supply
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Micro USB connector, 5 V, 500 mA
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Battery Type
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Lithium Ion 3.7 Vdc, 1200 mAh
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Battery Life
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8 Hours of continuous use
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Battery Charging Time
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Fully charged in 2.5 Hours
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+Physical
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Color
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Black
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Unit Weight with Batteries
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2.40 oz. (68 g)
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Shipping Weight
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3.20 oz. (91 g) with 1.0 lbs. (454 g) minimum
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Dimensions (H x W x D)
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3.75 x 2.00 x 0.64 in. (9.6 x 5 x 1.7 cm)
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Unit Weight
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1.60 oz. (45 g)
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Dimensions with Belt Clip
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3.75 x 2.00 x 0.80 in. (9.6 x 5.0 x 2.1 cm)
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+Environmental
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Temperature - Operation
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14 to 104 ºF (-10 to 40 ºC)
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Temperature - Storage
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(-)4 to 122 °F (-20 to 50 °C)
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Relative Humidity
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0 to 95% relative humidity, non-condensing
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