This product is available through authorized resellers.

Request Quote
Overview

The LR-4200-072KR receiver is one of Listen Technologies’ new generation of personal listening products, iDSP or Intelligent Digital Signal Processing.

With Listen’s unique DSP SQTM noise reduction technology, users experience 20 dB less noise and hiss than any other listening device. Advanced green battery technology dramatically reduces costs of ownership and hassles while reducing the number of batteries in landfills. A field replaceable Lithium-ion battery is included with the unit. The integrated neck loop / lanyard with DSP loop driver, improves the listening experience for T-coil users. iDSP is the smallest device of its kind, making it easier to wear and easier for venues to dispense, store and maintain.

The LR-4200-072KR has an OLED display to program channel names, monitor battery status, channel status, and charge activation. Connect the iDSP neck loop/lanyard or ear phones via two 3.5 mm output jacks (receivers can be shared).  The Micro USB connection is used with free iDSP software for charging, set up, programming, inventory management and firmware updates.

The result is an exceptional listening experience in places where it’s difficult to hear, like: theaters, lecture halls, concert venues, houses of worship, and more.

Includes

One (1) LR-4200-072KR Intelligent DSP RF Receiver (72 MHz)*

 

*The LR-4200-072KR comes with a quick start guide and a non-proprietary field replaceable Lithium-ion battery.

Highlights

  • Advanced DSP SQTM noise reduction technology delivers 20 dB less noise and hiss than any other listening device
  • Integrated neck loop / lanyard with DSP loop driver improves the listening experience for T-coil users
  • Smallest device of its kind makes it easier to wear and for venues to dispense, store and maintain
  • Limited Lifetime Warranty with hassle-free support
  • Can be worn around the neck, with the belt clip, or concealed in a pocket, making it the most discreet listening device on the market
  • Advanced green battery technology dramatically reduces costs of ownership and hassles while reducing the number of batteries in the landfill
  • Use for single channel applications
Configurations & Architectural Specs

Configurations

LR-4200-072KR Intelligent DSP RF Receiver (72 MHz)

Architectural Specs

The RF receiver shall be capable of receiving on 21 wide and narrow band channels.  The device shall tune to a single channel and user shall not be able to change the channel. The receiver shall have a signal-to-noise ratio of 70 dB or greater and shall have an audio frequency response of 50 Hz – 15 kHz (±3 dB). The device shall employ a unique DSP SQTM noise reduction technology. The unit shall have a programmable squelch circuit.  The unit shall incorporate a multi-functional display that indicates battery status, inventory number and channel. The device shall have the option of being lanyard or belt clip worn and the lanyard shall have the option of an integrated neck loop. The device shall have a USB connector used for inventory control, set up, charging and firmware upgrades. The device shall incorporate automatic battery charging circuitry and use a non-proprietary lithium ion battery. The device shall have additional charging contacts to allow multiple charging options.  The Listen LR-4200-072KR is specified.

CAD file(s)

Product Specifications
SpecificationLR-4200-072KR

Audio

System Distortion< 2% total harmonic distortion (THD) at 80% deviation
Output/sTwo (2) 3.5 mm (0.14 in.) connectors, unbalanced, 0 dBu nominal output level, 16 mW maximum, impedance 32 ohm
System Frequency Response50 Hz - 15 kHz (±3 dB)
System Signal to Noise RatioSQ enabled 70 dB, SQ disabled 50 dB

Controls

User ControlsPower, up/down volume
ProgrammingVia software and USB port
Set-up ControlsPress and hold up/down volume buttons for 5 seconds to enter channel adjust, use up/down to select channel

Indicators

LEDsFlashes when batteries are low or to indicate charging, solid when fully charged
DisplayChannel designation, battery level, unit number, charging status

RF

Frequency Range72.650 - 74.750 MHz
Number of Channels21 channels
Sensitivity.6uV typical, 1 uV maximum for 12 dB sinad
Frequency Accuracy± .005% stability 32 to 122 ºF (0 to 50 ºC)
SquelchProgrammable in 20 steps, automatic on loss of RF signal
Antenna TypeUses ear phone/neck loop lanyard and short ear phone cable or standard earphone cable

Power

Power SupplyMicro USB connector, 5 V, 500 mA
Battery TypeLithium Ion 3.7 Vdc, 1200 mAh
Battery Life8 Hours of continuous use
Battery Charging TimeFully charged in 2.5 Hours

Physical

ColorBlack
Unit Weight with Batteries2.40 oz. (68 g)
Shipping Weight3.20 oz. (91 g) with 1.0 lbs. (454 g) minimum
Dimensions (H x W x D)3.75 x 2.00 x 0.64 in. (9.6 x 5 x 1.7 cm)
Unit Weight1.60 oz. (45 g)
Dimensions with Belt Clip3.75 x 2.00 x 0.80 in. (9.6 x 5.0 x 2.1 cm)

Environmental

Temperature - Operation14 to 104 ºF (-10 to 40 ºC)
Temperature - Storage(-)4 to 122 °F (-20 to 50 °C)
Relative Humidity0 to 95% relative humidity, non-condensing

Compliance

StandardsKCC
Requirements
Used With
Accessories
FAQ
QWhat is the difference between the LR-4200 and the LR-5200?
AThe main difference is that the LR-5200 is programmable with a multi-function Listen button. It gives the user an opportunity to program only the desired channels and lockout the unused channels. This makes it simple to operate for end users that need to select between multiple active channels. The Listen Button can also be used to search for an active channel and lock the receiver on a specific channel.
QWhat is the purpose of Squelch?
AThe purpose of squelch is to mute the audio output of your receiver when the signal from the transmitter is turned off or is too weak to be received. Without squelch you would hear radio noise in your earphone. The squelch function can be programmed to the desired setting.
QWhat is the function of SQ?
ATo reduce noise of the systems, Listen offers a noise reduction technology called ListenSQ™. Both the transmitter and receiver must have SQ on to achieve the desired results. If you are planning to use this product with older Listen systems or equipment not manufactured by Listen, you should disable SQ.
QWhat type of battery technology does the LR-4200 use?
AThe LR-4200 uses a non-proprietary field replaceable Lithium Ion battery.
QHow long does it take to fully charge the LR-4200?
AIt varies dependent on the depletion of the battery. A fully depleted battery will charge in 2.5 hours or less.
QHow many LR-4200 receivers can I use in a system?
AAs many as you need, the number is endless.
QHow long will the LR-4200 run on a fully charged battery?
AThe LR-4200 will run continuously for 8 hours on a fully charged battery
Related Products
Systems Included In

My overall impression is very positive. The sound is clear and connects well with my telecoils. It is lightweight and comfortable on my neck. I like that I can open the loop to put it on and off my neck so I don't attract attention and I don't mess up my hair (vanity is so important! LOL).

Kathy Evans
Copyright © 1998 - 2019 Listen Technologies Corporation. All rights reserved.
Listen, ListenPoint and related marks and logos are registered trademarks of Listen Technologies Corporation. Terms of Use | Privacy Policy
Listen Technologies
Loading...
Loading...
Loading...
Loading...
Loading...