• Listen Technologies LS-57-072 iDSP Advanced Level II Stationary RF System
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Listen Technologies iDSP Advanced Stationary RF System For ADA Compliance Level II | 72 MHz | Standard

Listen Technologies iDSP Advanced Stationary RF System For ADA Compliance Level II | 72 MHz | Standard

SoundPro Item: 28447 | Part Number: LS-57-072

$2,572.00
$2,888.00 $2,572.00
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MSRP: $2,888.00 | MAP: $2,572.00

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  • DSP Noise Reduction Technology Cuts Background Hiss By 20 Decibels Compared To Standard RF Receivers
  • Integrated Neck Loop With DSP Loop Driver Enhances Listening Clarity For T-Coil Hearing Aid Users
  • Compact Receiver Design Simplifies Staff Dispensing Workflows And Improves User Comfort During Wear
  • Rechargeable Lithium-Ion Batteries Eliminate Disposable Battery Expense And Recharge In 2.5 Hours
  • Complete Compliance Signage Kit Meets ADA Notification Requirements For Public Venues
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Designed for houses of worship, performing arts centers, and public assembly spaces requiring ADA compliance, this system delivers multi-channel RF assistive listening with integrated DSP noise reduction that cuts background hiss by 20 dB compared to conventional receivers. The complete package includes transmitter, telescoping antenna, four rechargeable multi-channel receivers, ear speakers, neck loops with T-coil drivers, USB charging hub, and compliance signage—everything needed for immediate deployment.

The rechargeable lithium-ion batteries in each receiver eliminate disposable battery costs and recharge fully in under three hours, while multi-channel capability supports language interpretation or alternate audio feeds. Compact receiver form factor simplifies dispensing, storage, and maintenance workflows for staff while improving comfort for end users during extended wear.

Ideal for venues seeking a reliable, regulation-compliant solution that balances audio performance, operational efficiency, and total cost of ownership without requiring extensive infrastructure changes.

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Specifications

Certifications
Compliance Safety
RoHSRF: FCC Part 15, Part 90, Industry Canada
Compliance Standards
FCC Part 15, Part 90, Industry Canada, RoHS
Dimensions
Physical Dimensions (WxHxD)
8.5x1.75x9.13" (21.5x4.5x23cm)Color: Black with grey silk screeningUnit
Mounting Dimensions (WxDxH)
Bracket - 11x18x6.4cm (4.5x7x2.5"); Grounding Base - 20.4x20.4x5.1cm (8x8x2"); Mounting Plate - 11.4x11.6 (4.48x4.55")
Dipole Vertical Length
72 MHz - 203.2 cm (80"), 216 MHz - 68.6cm (27 in.)
Dimensions (HxWxD)
Rack Mount: 19x1.75x8" (48.3x4.4x20.3cm); Shipping Box: 14.2x2.95x10.6" (36x7.5x27cm)
Dimensions Hard Plaque
7x10” (178x254 mm)
Weight
Weight with Power Supply
1.6 kg (3.5 lbs.)Shipping
Electrical
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
Power Power Supply Input
100-240 V, 50-60 Hz, 0.5
Audio
Audio Frequency Response
50 Hz - 15 kHz (±3 dB)Signal-to-Noise
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 ohmHeadphone
Operation
-10 ºC (14 ºF) to +40 ºC (104 ºF)Temperature -
Distortion
< 2% total harmonic distortion (THD) at 80% deviationOutput/s: Two (2) 3.5 mm (0.14 in.) connectors, unbalanced, 0 dBu nominal output level, 16 mW maximum, impedance 32 ohmSystem
Signal to Noise Ratio
SQ enabled 80 dB, SQ disabled 60 dB
Sensitivity
115 dB +/- 4dB @ 1 kHz, 1 mWRated
Neck Loop Field Strength
400 mA/m (+/- 3dB)Neck
Loop Frequency Response
100Hz to 5kHz (+/- 3 dB ref 1kHz)
Connectivity
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
Supply Input
100-240 VAC, 50-60 Hz, 0.4
APower Supply Output
12 VDC, 1.3 A, 15.6
WPower Supply Connector
0.02 in (5.0 mm) OD, 0.01 in. (2.5 mm) ID, barrel typeCompliance: UL, CE, GS, TÜV, RoHS
USB Portset-up Controls
Press and hold up/down volume buttons for 5 seconds to enter channel adjust, use up/down to select channel
Power Input
50 mWMax
Construction
Physical Color
BlackUnit Weight with Batteries: 2.4 oz (68 g)Shipping Weight: 3.2 oz (91g) with 1 lbs (454g) minimumDimensions (HxWxD): 3.75x2x0.64" (9.6x5x1.7cm)Unit Weight: 1.6 oz (45 g)Dimensions with Belt Clip: 3.75x2x0.8" (9.6x5x2.1cm)
Included Items
Transmitter
One (1) LT-800-072-01 Stationary RF Transmitter (72 MHz)
Antenna Kit
One (1) LA-122 Universal Antenna Kit (72 MHz and 216 MHz)
Rack Mounting Kit
One (1) LA-326 Universal Rack Mounting Kit
Receivers
Four (4) LR-5200-072 Advanced Intelligent DSP RF Receiver (72 MHz)
Ear Speakers
Four (4) LA-401 Universal Ear Speaker
Neck Loop Lanyards
Two (2) LA-430 Intelligent Earphone/Neck Loop Lanyard
USB Charger
One (1) LA-423 4-Port USB Charger
Audio Cable
One (1) LPT-A107-B Dual RCA to Dual RCA Cable 6.6 ft. (2 m)
Signage Kit
One (1) LA-304 Assistive Listening Notification Signage Kit
Environmental
Humidity
0 to 95% relative humidity, noncondensing
Shipping
Shipping Weight
19.0 lbs (8.62 kg)
Weight
2.7 kg (6.0 lbs.)Rack
Physical Shipping Weight
1 lb (0.5kg)Cable
Identifiers
Length
6.6 ft (2m)Unit
General
Ratio
SQ enabled 80 dB, SQ disabled 60 dBAudio 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 VDCAudio Input 2: Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100k ohmAudio
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 processorProgramming: SQ on/off, process on/off, channel lock
Indicators LCD
Channel designation, lock status, RF power level, programming (front panel)Audio
Tone
Red LED illuminates when test tone is enabled.
RF Frequency Range
72.025 - 75.950 MHzNumber of Channels: 17 wide band, 40 narrow bandFrequency Accuracy: ± .005% stability +32º to +122 ºF (0º to +50 ºC)Antenna Type: Various antennas availableTransmitter Stability: 50 PPMTransmission 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 mNumber of Simultaneous Transmitters: Up to 8
Storage
-20 ºC (-4 ºF) to +50 ºC (122 ºF)Relative
Interconnections
BNC
Indicators LEDs
Flashes when batteries are low or to indicate charging, solid when fully chargedDisplay: Channel designation,battery level, unit number, charging status
MHzNumber of Channels
17 wide band, 40 narrow bandSensitivity: .6uV typical, 1 uV maximum for 12 dB sinadFrequency
Accuracy
± .005% stability 32 to 122 ºF (0 to 50 ºC)Squelch: Programmable in 20 steps, automatic on loss of
RF Signalantenna Type
Uses ear phone/neck loop lanyard and short ear phone cable or standard earphone cable
Type
Lithium Ion 3.7 Vdc, 1200 mAhBattery
Life
8 Hours of continuous useBattery
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)
LA-304 Signage Kit
Weight 6 oz. (170 g)
Soft Cling
7x10” (178x254 mm)
Indicators
Processing
Compression can be turned on/off, slope internally adjustable from 1:1 to 4:1, default 2:1Contour: Cuts and boosts frequencies above 5 kHzDistortion: < 2% total harmonic distortion (THD) at 80% deviationAudio
RF Power
Indicated on the LCD (low, mid, high)
Power
Charging Time
Fully charged in 2.5 Hours

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