The LS-53 Stationary RF System from Listen Technologies is a complete package that makes it quick and easy to offer a single-channel assistive listening solution to clients, customers, visitors, and more.

The LS-53 includes the LT-800-072 72 MHz Stationary RF Transmitter and four (4) high-performance LR-4200-072 iDSP receivers, as well as all of the accessories needed to provide assistive listening right away. The included telescoping antenna provides excellent transmitter range, and the notification signage kit (LA-304) helps ensure compliance with ADA requirements.

The LS-53 also comes complete with universal ear speakers, intelligent earphone/neck loop lanyards, a four-port USB charger, and an RCA cable. The complete system is great for meeting the needs of small or medium-size venues with a capacity of up to 100 people.

Listen Technologies LS-53-072 iDSP Prime Level I 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
Advanced green battery technology dramatically reduces costs of ownership and hassles while reducing the number of batteries in the landfill
Ensures public venues deliver an exceptional listening experience while meeting new legislative requirements for assistive listening

LT-800-072-01 Stationary RF Transmitter (72 MHz)1
LA-106 Telescoping Top Mounted Antenna (72 MHz)1
LR-4200-072 Intelligent DSP RF Receiver (72 MHz)4
LA-401 Universal Ear Speaker4
LA-430 Intelligent Earphone/Neck Loop Lanyard2
LA-423 4-Port USB Charger1
LPT-A107-B Dual RCA to Dual RCA Cable 6.6 ft. (2 m)1
LA-304 Assistive Listening Notification Signage Kit1

LT-800-072-01 72MHz Stationary RF Transmitter
- Audio
  - Frequency Response: 50 Hz - 15 kHz (±3 dB)
  - Signal-to-Noise Ratio: SQ enabled 80 dB, SQ disabled 60 dB
  - 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, +21 / -30 dBu (line/mic) maximum input level, impedance 20k / 1k ohm (line/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 100k ohm
  - 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
  - Distortion: < 2% total harmonic distortion (THD) at 80% deviation
  - 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 ohm
  - Headphone Output: Front panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 ohm
- Controls
  - User Controls: Front Panel: Power, test tone on/off, channel up/down, input levels, mix level, contour, monitor volume controlRear 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
  - LCD: Channel designation, lock status, RF power level, programming (front panel)
  - 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)
  - Test Tone: Red LED illuminates when test tone is enabled.
  - RF Power: Indicated on the LCD (low, mid, high)
- RF
  - Frequency Range: 72.025 - 75.950 MHz
  - Number of Channels: 17 wide band, 40 narrow band
  - Frequency Accuracy: ± .005% stability +32º to +122 ºF (0º to +50 ºC)
  - Antenna Type: Various antennas available
  - Transmitter Stability: 50 PPM
  - Transmission Range: Up to 305 m (1,000 ft.)
  - Antenna Connector: BNC, 50 Ohms (Use RG-58 < 100 ft or RG-8 > 100ft)
  - Output Power: 80,000 uV at 3 m
  - Number of Simultaneous Transmitters: Up to 8
- Power
  - 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 in (5.0 mm) OD, 0.01 in. (2.5 mm) ID, barrel type
  - Compliance: UL, CE, GS, TÜV, RoHS
- Physical
  - Dimensions (WxHxD): 8.5x1.75x9.13" (21.5x4.5x23cm)
  - Color: Black with grey silk screening
  - Unit Weight with Power Supply: 1.6 kg (3.5 lbs.)
  - Shipping Weight: 2.7 kg (6.0 lbs.)
  - 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)
  - Weight: 1.2 kg (2.6 lbs)
- 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, noncondensing
- Compliance
  - Safety: RoHS
  - RF: FCC Part 15, Part 90, Industry Canada
LA-106 Telescoping Top Mounted Antenna
- Interconnections
  - Thread Diameter: 10-32
- RF
  - Frequency Range: 72.025 - 75.950 MHz
  - Number of Channels: 57 (17 wide, 40 narrow)
  - Typical Range: Range up to 198 m / 650 ft.
- Physical
  - Length: 99 cm (39.00 in.)
  - Color: Black
  - Shipping Weight: 0.5 kg (1 lb)
  - Diameter: 1.3 cm (0.31")
  - Weight: 31g (1.10 oz)
LR-4200-072 Intelligent DSP RF Receiver
- Audio
  - 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 ohm
  - System Frequency Response: 50 Hz - 15 kHz (±3 dB)
  - System Signal to Noise Ratio: SQ enabled 80 dB, SQ disabled 60 dB
- Controls
  - User Controls: Power, up/down volume
  - Programming: Via software and USB port
  - Set-up Controls: Press and hold up/down volume buttons for 5 seconds to enter channel adjust, use up/down to select channel
- Indicators
  - LEDs: Flashes when batteries are low or to indicate charging, solid when fully charged
  - Display: Channel designation, battery level, unit number, charging status
- RF
  - Frequency Range: 72.0250 - 75.9500 MHz
  - Number of Channels: 17 wide band, 40 narrow band
  - Sensitivity: .6uV typical, 1 uV maximum for 12 dB sinad
  - Frequency Accuracy: ± .005% stability 32 to 122 ºF (0 to 50 ºC)
  - Squelch: Programmable in 20 steps, automatic on loss of RF signal
  - Antenna Type: Uses earphone/neck loop lanyard and short ear phone cable or standard earphone cable
- Power
  - Power Supply: Micro USB connector, 5 V, 500 mA
  - Battery Type: Lithium Ion 3.7 Vdc, 1200 mAh
  - Battery Life: 8 Hours of continuous use
  - Battery Charging Time: Fully charged in 2.5 Hours
- Physical
  - Color: Black
  - Unit Weight with Batteries: 2.4 oz. (68 g)
  - Shipping Weight: 3.2 oz. (91 g) with 1 lbs (454 g) minimum; unit weight: 1.6 oz. (45 g)
  - Dimensions (HxWxD): 3.75x2x0.64" (9.6x5x1.7cm); with belt clip: 3.75x2x0.8" (9.6x5x2.1cm)
- 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
LA-401 Universal Ear Speaker
- Audio
  - Frequency Response: 20 Hz - 20 kHz
  - Impedance: 32 ohm +/- 15% @ 1 kHz
  - Input Sensitivity: 115 dB +/- 4dB @ 1 kHz, 1 mW
  - Rated Power Input: 50 mW
  - Max Power Input: 100 mW
- Interconnections: Male 3.5 mm (TRS)
- Physical
  - Color: Dark Gray
  - Shipping Weight: 1 lbs (454g)
  - Cable Length: 13" (33cm), extension cable is 28" (71 cm)
  - Unit Weight: 0.4 oz (11g)
- Compliance Standards: RoHS
LA-430 Integrated Neck Loop
- 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)
- Loop
  - Neck Loop Field Strength: 400 mA/m (+/- 3dB)
  - Neck Loop Frequency Response: 100Hz to 5kHz (+/- 3 dB ref 1kHz)
- Physical
  - Color: Black
  - Shipping Weight: 1 lbs. (454 g)
  - Cord Length: 29" (74 cm)
  - Unit Weight: 1.5 oz. (43 g)
- Compliance Standards: RoHS, IEC60118-4
LA-423 USB Charger
- Power
  - Power Supply Input: 100-240 V, 50-60 Hz, 0.5 A
  - Power Supply Output: 5.0 VDC, 4.2 A
- Physical
  - Color: Black
  - Shipping Weight: 1 lbs. (454g)
  - Cable Length: 36" (92cm)
  - Cable Type: 4 - USB to Micro USB Cables (LA-422)
  - Dimensions (HxWxD): 2.44x2.9x1.13" (62x74x29mm)
  - Unit Weight: 7.8 oz (221g)
- Compliance Standards: UL, FCC, RoHS, CE. RCM
LPT-A107B Cable
- Interconnections: Dual RCA (male) to Dual RCA (male)
- Physical
  - Shipping Weight: 1 lb (0.5kg)
  - Cable Length: 6.6 ft (2m)
  - Unit Weight: 1.75 oz (49g)
LA-304 Signage Kit
- Shipping Weight: 1 lb (0.5 kg)
- Weight 6 oz. (170 g)
- Dimensions Hard Plaque: 7x10” (178x254 mm); Soft Cling: 7x10” (178x254 mm)