Listen Technologies LS-55-072
iDSP Prime Level III Stationary RF System (72MHz)

OUR PART #  LS-55-072


The Listen Technologies LS-55-072 is a complete assistive listening package that comes equipped with the LR-4200-072 receiver, Listen's new generation of personal listening products, iDSP or Intelligent Digital Signal Processing. The iDSP 72MHz receiver revolutionizes how an RF system works, offering precise clarity with 20 dB less hiss than other RF receivers.

The new integrated neck loop improves the experience for people who have hearing aids and cochlear implants with telecoils. Sleek and small, the iDSP receiver has a field replaceable, non-proprietary rechargeable lithium-ion battery, making obsolete the use of alkaline and NiMH batteries. Battery life is eight hours, with a 2.5-hour charge time.

The result is an innovative personal listening technology and solution that delivers an exceptional listening experience for end users and an optimal experience for the venues that provide listening devices.

Great for larger venues to deliver an optimum range of up to 1,500 ft. (457.2m). Includes the LA-381 drop-in charging/dispensing station for the Listen iDSP products. It is engineered for streamlined dispensing, collecting and care of the iDSP LR-4200 RF listening devices. The charging tray can be mounted several ways; wall, drawer, rack, or table top- all for easy dispensing. An optional cable management system can be ordered to keep the dispensing station looking neat and organized.

The included integrated neck loop/lanyard and signage ensures the system meets the minimum legislative requirements for veunes with a capacity up to 100.

Listen Technologies LS-55-072 Includes:

  • One (1) LT-800-072-01 Stationary RF Transmitter (72 MHz)
  • One (1) LA-122 Universal Antenna Kit (72 MHz and 216 MHz)
  • One (1) LA-326 Universal Rack Mounting Kit
  • Four (4) LR-4200-072 Intelligent DSP RF Receiver (72 MHz)
  • Four (4) LA-401 Universal Ear Speaker
  • Two (2) LA-430 Intelligent Earphone/Neck Loop Lanyard
  • One (1) LPT-A107-B Dual RCA to Dual RCA Cable 6.6 ft.(2 m)
  • One (1) LA-381-01 Intelligent 12-Unit Charging Tray
  • One (1) LA-304 Assistive Listening Notification Signage Kit

Listen Technologies LS-55-072 Features:

  • Advanced DSP SQ 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
  • Advanced green battery technology dramatically reduces costs of ownership and hassles while reducing the number of batteries in the landfill
  • Includes drop-in charging/dispensing station for streamlined dispensing, collecting and care of up to (12) iDSP RF listening devices
  • Ensures public venues deliver an exceptional listening experience while meeting new legislative requirements for assistive listening

Listen Technologies LS-55-072 Specifications:

  • LT-800-072-01 Transmitter:
    • Audio:
      • Frequency Response:  50 Hz - 15 kHz (+/- 3 dB)
      • Signal-to-Noise Ratio:  SQ enabled 80 dB, SQ disabled 60 dB
      • Distortion:  < 2% total harmonic distortion (THD) at 80% deviation
      • Audio Input 1:  Rear panel, one (1) Female XLR or 1/4 in combo connector, balanced, 0 / -55 dBu (line/mic) nominal input level adjustable, -30 / +21 dBu (line/mic) maximum input level, impedance 20 kOhms (line) /1 kOhms (mic), phantom power +12 VDC
      • Audio Input 2:  Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100  kOhms
      • Audio Processing:  Compression can be turned on/off, slope internally adjustable from 1:1 to 4:1, default 2:1
      • Contour:  Cuts and boosts frequencies above 5 kHz
      • Audio Output:  Input 1 and input 2, mixed output (rear panel), two (2) phono connectors, unbalanced, -10 dBu nominal output level, +15 dBu maximum, impedance 10 Ohms
      • Headphone Output:  Front panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 Ohms
    • Controls:
      • User Controls:  Front Panel: Power, test tone on/off, channel up/down, input levels, mix level, contour, monitor volume control Rear Panel: Input 1 Level, (Line, Mic, Mic-Phantom Power), Input 2 level
      • (10 / +10 dBu), RF power level (low, mid, high)
      • Internal Adjustments:  Compression ratio for audio processor
      • Programming:  SQ on/off, process on/off, channel lock
    • Indicators:  
      • Audio Input Status LEDs:  Indicates Input 1, Input 2, and Mix audio levels; 10 segment LED's (8 green, 2 red)
      • Processing:  Indicated by a green LED when on (front panel)
      • RF Power:  Indicated on the LCD (low, mid, high)
      • LCD:  Channel designation, lock status, RF power level, programming (front panel)
      • Test Tone:  Red LED illuminates when test tone is enabled.
    • RF:  
      • Frequency Range:  72.025 - 75.950 MHz
      • Number of Channels:  17 wide band, 40 narrow band
      • Number of Simultaneous Transmitters:  6
      • Frequency Accuracy:  +/- .005% stability +32º to +122 ºF (0º to +50 ºC)
      • Transmitter Stability:  50 PPM
      • Transmission Range:  Up to 1,500 ft. (457 m)
      • Output Power:  80,000 uV at 3 m
      • Antenna Type:  Various antennas available
      • Antenna Connector:  BNC
    • Power:
      • Compliance:  UL, CE, GS, TÜV, RoHS
      • Power Supply:  In line power supply, Listen part number LA-207 (Line cord is determined by the each Country's AC power standards)
      • Power Supply Input:  100-240 VAC, 50-60 Hz, 0.4 A
      • Power Supply Output:  12 VDC, 1.3 A, 15.6 W
      • Power Supply Connector:  0.02" (5.0mm) OD, 0.01" (2.5mm) ID, barrel type
    • Physical:
      • Dimensions (HxWxD):  1.75" x 8.50" x 9.13" (4.5cm x 21.5cm x 23cm) 
      • Color:  Dark Grey with white silk screening
      • Weight:  2.6 lbs. (1.2 kg)
      • Unit Weight with Power Supply:  3.5 lbs. (1.6 kg)
      • Rack Mounting:  One (1) rack space height, 1/2 rack space wide. One (1) or two (2) transmitters can be mounted in one rack space, optional rack mount (LA-326)
    • Environmental:  
      • Temperature - Operation:  -10 ºC (14 ºF) to +40 ºC (104 ºF)
      • Temperature - Storage:  -20 ºC (-4 ºF) to +50 ºC (122 ºF)
      • Relative Humidity:  0 to 95% relative humidity, non condensing
    • Compliance:  
      • Safety:  RoHS
      • RF:  FCC Part 15, Part 90, Industry Canada
  • LR-4200-072 Receiver:
    • Audio:  
      • System Frequency Response:  50 Hz - 15 kHz (+/- 3 dB)
      • System Signal to Noise Ratio:  SQ enabled 80 dB, SQ disabled 60 dB
      • System Distortion:  < 2% total harmonic distortion (THD) at 80% deviation
      • Output/s:  Two (2) 3.5 mm (0.14 in.) connectors, unbalanced, 0 dBu nominal output level, 16 mW maximum, impedance 32 Ohms
    • Controls:
      • User Controls:  Power, up/down volume
      • Set-up Controls:  Press and hold up/down volume buttons for 5 seconds to enter channel adjust, use up/down to select channel
      • Programming:  Via software and USB port
    • Indicators:  
      • Display:  Channel designation,battery level, unit number, charging status
      • LEDs:  Flashes when batteries are low or to indicate charging, solid when fully charged
    • RF:  
      • Frequency Range:  72.0250 - 75.9500 MHz
      • Number of Channels:  17 wide band, 40 narrow band
      • Sensitivity:  0.6uV typical, 1 uV maximum for 12 dB sinad
      • Frequency Accuracy:  +/- 0.005% stability 32 to 122 ºF (0 to 50 ºC)
      • Antenna Type:  Uses ear phone/neck loop lanyard and short ear phone cable or standard earphone cable
      • Squelch:  Programmable in 20 steps, automatic on loss of RF signal
    • Power:
      • Battery Life:  8 Hours of continuous use
      • Power Supply:  Micro USB connector, 5 V, 500 mA
      • Battery Type:  Lithium Ion 3.7 Vdc, 1200 mAh
      • Battery Charging Time:  Fully charged in 2.5 Hours
    • Physical:  
      • Dimensions (HxWxD):  3.75" x 2.00" x 0.64" (9.6 x 5 x 1.7 cm)
      • Dimensions with Belt Clip:  3.75" x 2.00" x 0.80" (9.6 x 5.0 x 2.1 cm)
      • Unit Weight:  1.60 oz. (45 g)
      • Unit Weight with Batteries:  2.40 oz. (68 g)
      • Shipping Weight:  3.20 oz. (91 g) with 1.0 lbs. (454 g) minimum
      • Color:  Black
    • Environmental:  
      • Temperature - Operation:  14 to 104 ºF (-10 to 40 ºC)
      • Temperature - Storage:  (-)4 to 122 °F (-20 to 50 °C)
      • Relative Humidity:  0 to 95% relative humidity, non-condensing
    • Compliance Standards:  FCC Part 15, Part 90, Industry Canada, RoHS

Listen Technologies LS-55-072
iDSP Prime Level III Stationary RF System (72MHz)

OUR PART #  LS-55-072

Product Information:

The Listen Technologies LS-55-072 is a complete assistive listening package that comes equipped with the LR-4200-072 receiver, Listen's new generation of personal listening products, iDSP or Intelligent Digital Signal Processing. The iDSP 72MHz receiver revolutionizes how an RF system works, offering precise clarity with 20 dB less hiss than other RF receivers.

The new integrated neck loop improves the experience for people who have hearing aids and cochlear implants with telecoils. Sleek and small, the iDSP receiver has a field replaceable, non-proprietary rechargeable lithium-ion battery, making obsolete the use of alkaline and NiMH batteries. Battery life is eight hours, with a 2.5-hour charge time.

The result is an innovative personal listening technology and solution that delivers an exceptional listening experience for end users and an optimal experience for the venues that provide listening devices.

Great for larger venues to deliver an optimum range of up to 1,500 ft. (457.2m). Includes the LA-381 drop-in charging/dispensing station for the Listen iDSP products. It is engineered for streamlined dispensing, collecting and care of the iDSP LR-4200 RF listening devices. The charging tray can be mounted several ways; wall, drawer, rack, or table top- all for easy dispensing. An optional cable management system can be ordered to keep the dispensing station looking neat and organized.

The included integrated neck loop/lanyard and signage ensures the system meets the minimum legislative requirements for veunes with a capacity up to 100.

Listen Technologies LS-55-072 Includes:

  • One (1) LT-800-072-01 Stationary RF Transmitter (72 MHz)
  • One (1) LA-122 Universal Antenna Kit (72 MHz and 216 MHz)
  • One (1) LA-326 Universal Rack Mounting Kit
  • Four (4) LR-4200-072 Intelligent DSP RF Receiver (72 MHz)
  • Four (4) LA-401 Universal Ear Speaker
  • Two (2) LA-430 Intelligent Earphone/Neck Loop Lanyard
  • One (1) LPT-A107-B Dual RCA to Dual RCA Cable 6.6 ft.(2 m)
  • One (1) LA-381-01 Intelligent 12-Unit Charging Tray
  • One (1) LA-304 Assistive Listening Notification Signage Kit

Listen Technologies LS-55-072 Features:

  • Advanced DSP SQ 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
  • Advanced green battery technology dramatically reduces costs of ownership and hassles while reducing the number of batteries in the landfill
  • Includes drop-in charging/dispensing station for streamlined dispensing, collecting and care of up to (12) iDSP RF listening devices
  • Ensures public venues deliver an exceptional listening experience while meeting new legislative requirements for assistive listening

Listen Technologies LS-55-072 Specifications:

  • LT-800-072-01 Transmitter:
    • Audio:
      • Frequency Response:  50 Hz - 15 kHz (+/- 3 dB)
      • Signal-to-Noise Ratio:  SQ enabled 80 dB, SQ disabled 60 dB
      • Distortion:  < 2% total harmonic distortion (THD) at 80% deviation
      • Audio Input 1:  Rear panel, one (1) Female XLR or 1/4 in combo connector, balanced, 0 / -55 dBu (line/mic) nominal input level adjustable, -30 / +21 dBu (line/mic) maximum input level, impedance 20 kOhms (line) /1 kOhms (mic), phantom power +12 VDC
      • Audio Input 2:  Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100  kOhms
      • Audio Processing:  Compression can be turned on/off, slope internally adjustable from 1:1 to 4:1, default 2:1
      • Contour:  Cuts and boosts frequencies above 5 kHz
      • Audio Output:  Input 1 and input 2, mixed output (rear panel), two (2) phono connectors, unbalanced, -10 dBu nominal output level, +15 dBu maximum, impedance 10 Ohms
      • Headphone Output:  Front panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 Ohms
    • Controls:
      • User Controls:  Front Panel: Power, test tone on/off, channel up/down, input levels, mix level, contour, monitor volume control Rear Panel: Input 1 Level, (Line, Mic, Mic-Phantom Power), Input 2 level
      • (10 / +10 dBu), RF power level (low, mid, high)
      • Internal Adjustments:  Compression ratio for audio processor
      • Programming:  SQ on/off, process on/off, channel lock
    • Indicators:  
      • Audio Input Status LEDs:  Indicates Input 1, Input 2, and Mix audio levels; 10 segment LED's (8 green, 2 red)
      • Processing:  Indicated by a green LED when on (front panel)
      • RF Power:  Indicated on the LCD (low, mid, high)
      • LCD:  Channel designation, lock status, RF power level, programming (front panel)
      • Test Tone:  Red LED illuminates when test tone is enabled.
    • RF:  
      • Frequency Range:  72.025 - 75.950 MHz
      • Number of Channels:  17 wide band, 40 narrow band
      • Number of Simultaneous Transmitters:  6
      • Frequency Accuracy:  +/- .005% stability +32º to +122 ºF (0º to +50 ºC)
      • Transmitter Stability:  50 PPM
      • Transmission Range:  Up to 1,500 ft. (457 m)
      • Output Power:  80,000 uV at 3 m
      • Antenna Type:  Various antennas available
      • Antenna Connector:  BNC
    • Power:
      • Compliance:  UL, CE, GS, TÜV, RoHS
      • Power Supply:  In line power supply, Listen part number LA-207 (Line cord is determined by the each Country's AC power standards)
      • Power Supply Input:  100-240 VAC, 50-60 Hz, 0.4 A
      • Power Supply Output:  12 VDC, 1.3 A, 15.6 W
      • Power Supply Connector:  0.02" (5.0mm) OD, 0.01" (2.5mm) ID, barrel type
    • Physical:
      • Dimensions (HxWxD):  1.75" x 8.50" x 9.13" (4.5cm x 21.5cm x 23cm) 
      • Color:  Dark Grey with white silk screening
      • Weight:  2.6 lbs. (1.2 kg)
      • Unit Weight with Power Supply:  3.5 lbs. (1.6 kg)
      • Rack Mounting:  One (1) rack space height, 1/2 rack space wide. One (1) or two (2) transmitters can be mounted in one rack space, optional rack mount (LA-326)
    • Environmental:  
      • Temperature - Operation:  -10 ºC (14 ºF) to +40 ºC (104 ºF)
      • Temperature - Storage:  -20 ºC (-4 ºF) to +50 ºC (122 ºF)
      • Relative Humidity:  0 to 95% relative humidity, non condensing
    • Compliance:  
      • Safety:  RoHS
      • RF:  FCC Part 15, Part 90, Industry Canada
  • LR-4200-072 Receiver:
    • Audio:  
      • System Frequency Response:  50 Hz - 15 kHz (+/- 3 dB)
      • System Signal to Noise Ratio:  SQ enabled 80 dB, SQ disabled 60 dB
      • System Distortion:  < 2% total harmonic distortion (THD) at 80% deviation
      • Output/s:  Two (2) 3.5 mm (0.14 in.) connectors, unbalanced, 0 dBu nominal output level, 16 mW maximum, impedance 32 Ohms
    • Controls:
      • User Controls:  Power, up/down volume
      • Set-up Controls:  Press and hold up/down volume buttons for 5 seconds to enter channel adjust, use up/down to select channel
      • Programming:  Via software and USB port
    • Indicators:  
      • Display:  Channel designation,battery level, unit number, charging status
      • LEDs:  Flashes when batteries are low or to indicate charging, solid when fully charged
    • RF:  
      • Frequency Range:  72.0250 - 75.9500 MHz
      • Number of Channels:  17 wide band, 40 narrow band
      • Sensitivity:  0.6uV typical, 1 uV maximum for 12 dB sinad
      • Frequency Accuracy:  +/- 0.005% stability 32 to 122 ºF (0 to 50 ºC)
      • Antenna Type:  Uses ear phone/neck loop lanyard and short ear phone cable or standard earphone cable
      • Squelch:  Programmable in 20 steps, automatic on loss of RF signal
    • Power:
      • Battery Life:  8 Hours of continuous use
      • Power Supply:  Micro USB connector, 5 V, 500 mA
      • Battery Type:  Lithium Ion 3.7 Vdc, 1200 mAh
      • Battery Charging Time:  Fully charged in 2.5 Hours
    • Physical:  
      • Dimensions (HxWxD):  3.75" x 2.00" x 0.64" (9.6 x 5 x 1.7 cm)
      • Dimensions with Belt Clip:  3.75" x 2.00" x 0.80" (9.6 x 5.0 x 2.1 cm)
      • Unit Weight:  1.60 oz. (45 g)
      • Unit Weight with Batteries:  2.40 oz. (68 g)
      • Shipping Weight:  3.20 oz. (91 g) with 1.0 lbs. (454 g) minimum
      • Color:  Black
    • Environmental:  
      • Temperature - Operation:  14 to 104 ºF (-10 to 40 ºC)
      • Temperature - Storage:  (-)4 to 122 °F (-20 to 50 °C)
      • Relative Humidity:  0 to 95% relative humidity, non-condensing
    • Compliance Standards:  FCC Part 15, Part 90, Industry Canada, RoHS
Add to Cart

We're sorry, only of this item available



Call a Sales Pro at for more information

Serving Contractors, Dealers, and Installers Since 1977

Contact: 1-800-828-0509 / Hours: Mon - Fri 7:00AM - 7:00PM