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Listen Technologies Listen Tech LS-31-072 iDSP Essentials Level 2 Stationary RF System (72 MHz)
Equipment Sales & Professional Installation
MPN: LT-LS-31-072
- Complete out-of-the-box system — transmitter, antenna kit, rack kit, four receivers, ear speakers, neck loops, cable, charger, and ADA signage all included
- 1,000 ft. (305 m) line-of-sight coverage with the included LA-122 Universal Antenna Kit
- Three selectable 72 MHz channels (A / E / H) with lockable tuning to prevent accidental changes
- 100% digital receiver tuning — no channel drift during long sessions
- Universal transmitter inputs — balanced XLR/¼-in. combo with phantom power plus unbalanced RCA, independently mixable
- Selectable RF output (low / mid / high) for right-sizing coverage to the room
- Look & Listen LCD shows channel, lock status, and RF power level
- 80 dB system SNR with ListenSQ noise reduction enabled; 50 Hz – 15 kHz (±3 dB) response
- 24-hour receiver battery life , full recharge in 2.5 hours, field-replaceable non-proprietary Li-ion cells
- T-coil compatible via two included neck loop lanyards with DSP loop driver
- Dual 3.5 mm receiver outputs let two listeners share a single unit
- iDSP Software Suite compatible for programming, firmware updates, and inventory management
- Half-rack transmitter mounts one or two units per rack space with the included LA-326 kit
- Unlimited receiver capacity — add units at any time without reconfiguring the system
- ADA notification signage kit included (LA-304)
Specifications
Listen Tech LS-31-072 System
| Manufacturer Part Number | LS-31-072 |
|---|---|
| System Type | RF (radio frequency) assistive listening system, 72 MHz band |
| Channels | 3 wide-band A: 72.100 MHz E: 72.900 MHz H: 75.900 MHz |
| Transmission Range | Up to 1,000 ft (305 m) line of sight |
| Frequency Response (±3 dB) | 50 Hz - 15 kHz (end-to-end) |
| Signal-to-Noise (S/N) Ratio | ≥62 dB (end-to-end) |
| Shipping Weight | 13.08 lbs (5.94 kg) |
Transmitter (LT-803-072-01)
| Frequency Response (±3 dB) | 50 Hz - 15 kHz |
|---|---|
| Signal-to-Noise (S/N) Ratio | 62 dB (A-weighted) |
| Distortion (THD) | < 2% at 80% deviation |
| Audio Input 1 | Female XLR / ¼" combo, balanced 0 / -55 dBu nominal (line/mic), adjustable -30 / +21 dBu maximum 20kΩ / 1kΩ impedance +12 VDC phantom power |
| Audio Input 2 | (2) RCA phono, unbalanced -10 / +10 dBu nominal, adjustable +30 dBu maximum 100kΩ impedance |
| Audio Output | (2) RCA phono, unbalanced, mixed -10 dBu nominal; +15 dBu maximum 10Ω impedance |
| Headphone Output | 3.5 mm stereo, front panel Adjustable; +3 dBu maximum 10Ω impedance |
| Audio Processing | Switchable compression, internally adjustable 1:1 to 4:1 (2:1 default) |
| Contour Control | Cuts or boosts content above 5 kHz |
| RF Output Power | 80,000 µV at 3 m; low / mid / high selectable |
| Frequency Accuracy | ±0.005% stability, 32°F - 122°F (0°C - 50°C) |
| Transmitter Stability | 50 PPM |
| Antenna Interface | BNC/50Ω RG-58 under 100 ft; RG-8 over 100 ft |
| Display | Look & Listen LCD; channel, lock status, RF power |
| Indicators | 10-segment input level LEDs (8 green, 2 red) Processing LED Test tone LED |
| Power Supply | LA-207 in-line Input: 100-240 VAC, 50-60 Hz, 0.4 A Output: DC 12V/1.3A, 15.6 W |
| Rack Mounting | 1 RU height, half-rack width; one or two units per rack space |
| Dimensions (H x W x D) | 1.75" (45 mm) x 8.5" (215 mm) x 9.13" (230 mm) |
| Weight | 2.6 lbs (1.2 kg) 4.5 lbs (2.06 kg) with power supply |
| Color | Dark grey with white silkscreen |
| Compliance | FCC Part 15, FCC Part 90, Industry Canada Power supply: UL, CE, GS, TÜV, RoHS |
Receiver (LR-3200-072, Qty 4)
| Frequency Response (±3 dB) | 50 Hz - 15 kHz |
|---|---|
| Signal-to-Noise (S/N) Ratio | 70 dB (SQ disabled) 80 dB (SQ enabled) |
| Distortion (THD) | < 1% at 80% deviation |
| Outputs | (2) 3.5 mm, unbalanced 0 dBu nominal; 50 mW maximum 32Ω impedance |
| RF Range | 72.0250 MHz - 75.9500 MHz |
| Channels | Basic mode: 3 wide band Expand mode: 17 wide band |
| Receive Sensitivity | 0.6 µV typical; 1 µV maximum for 12 dB SINAD |
| Frequency Accuracy | ±0.005% stability, 32°F - 122°F (0°C - 50°C) |
| Squelch | Fixed level, automatic on loss of RF signal |
| Battery | Lithium-ion, 3.7 VDC, 1200 mAh, field replaceable (Included) |
| Max Battery Life | Up to 24 hours continuous use |
| Charge Time | 2.5 hours to full |
| Power Supply | Micro USB, DC 5V/500mA External charging contacts |
| User Controls | Power, volume up/down Channel select via 5-second button hold |
| Programming | iDSP Software Suite via USB |
| Dimensions (H x W x D) | 3.75" (96 mm) x 2" (50 mm) x 0.64" (17 mm) without belt clip 3.75" (96 mm) x 2" (50 mm) x 0.8" (21 mm) with belt clip |
| Weight | 0.15 lbs (68 g) with battery |
| Color | Black |
| Compliance | FCC Part 15 Class B, Industry Canada ICES-3 (B), RoHS |
Environmental
| Operating Temperature | 14°F - 104°F (-10°C - 40°C) |
|---|---|
| Storage Temperature | -4°F - 122°F (-20°C - 50°C) |
| Relative Humidity | 0% - 95%, non-condensing |
Documents
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