icListen HF Hydrophone
High-frequency underwater acoustic recorder for marine research and monitoring
The icListen HF Smart Digital Hydrophone is a compact, all-in-one solution for collecting high-quality underwater acoustic data. Fully calibrated and ready to deploy, it combines acoustic sensing, onboard processing, data storage, and real-time streaming in a single instrument.
Ocean Sonics follows the International Electrotechnical Commission (IEC) industry standards for electronic devices IEC 60565.
Key Features & Benefits
Wideband Acoustic Monitoring
Capture detailed underwater sound from 10 Hz to 200 kHz with ultra-low self-noise and wide dynamic range.
Real-Time Processing​
Process and analyze acoustic data onboard for immediate access to useful information.​
Event Detection
Use Epoch Mode to identify acoustic events and support real-time decision-making.
Real-Time Data Access
Stream spectral or WAV data to your device and control icListen settings through a web browser.
Flexible Depth Options
Choose from 900 m, 3500 m, or 6000 m depth ratings for a range of deployment environments.
Multi-Hydrophone Capability
Connect and synchronize multiple hydrophones for coordinated, multi-channel acoustic monitoring.
Which icListen Hydrophone Is For You?
icListen HF ALTA
High-frequency hydrophone for detailed broadband acoustic monitoring and event detection.
Frequency: 10 Hz - 200 kHz
Sensitivity: -172 dB re V/uPa
Max SPL RMS: 179 dB re uPa
Depth Rating: 900 m, 3500 m, 6000 m
Communication Interface: Ethernet
Modes: Waveform/FFT/Event Detection Viewing icListen HF
Frequency: 10 Hz - 200 kHz
Sensitivity: -172 dB re V/uPa
Max SPL RMS: 179 dB re uPa
Depth Rating: 900 m, 3500 m, 6000 m
Communication Interface: Ethernet
Modes: Waveform/FFT/Event Detection Viewing icListen HF
icListen AF ALTA
High-sensitivity, lower-frequency hydrophone for low-frequency soundscapes and acoustic monitoring.
Frequency: 10 Hz - 12.8 kHz
Sensitivity: -162 dB re V/uPa
Max SPL RMS: 168 dB re uPa
Depth Rating: 900 m, 3500 m
Communication Interface: Ethernet
Modes: Waveform/FFT/Event Detection View icListen AF →
Frequency: 10 Hz - 12.8 kHz
Sensitivity: -162 dB re V/uPa
Max SPL RMS: 168 dB re uPa
Depth Rating: 900 m, 3500 m
Communication Interface: Ethernet
Modes: Waveform/FFT/Event Detection View icListen AF →
icListen Kayak ALTA
Compact, low-power hydrophone purpose-built for scalable, synchronized multi-hydrophone arrays.
Frequency: 10 Hz - 200 kHz
Sensitivity: -172 dB re V/uPa
Max SPL RMS: 179 dB re uPa
Depth Rating: 900 m, 3500 m
Communication Interface: Ethernet
Modes: Waveform/FFT/Event Detection View icListen Kayak →
Frequency: 10 Hz - 200 kHz
Sensitivity: -172 dB re V/uPa
Max SPL RMS: 179 dB re uPa
Depth Rating: 900 m, 3500 m
Communication Interface: Ethernet
Modes: Waveform/FFT/Event Detection View icListen Kayak →
Additional Configurations Available
icListen hydrophones are available in different configurations to accommodate specific monitoring requirements. Refer to the product specification sheet for available options, or contact our sales team to discuss the best configuration for your project.
Product Resources
icListen HF Applications
Real Time Situational Awareness
icListen hydrophones provide real-time underwater acoustic data to help detect potential threats, monitor vessel activity, and improve situational awareness during maritime operations.
Acoustic Ranges
icListen hydrophones provide calibrated acoustic measurements to assess noise emitted by naval vessels and submarines. Their synchronization capabilities support multi-hydrophone arrays for fixed and portable acoustic ranges.
SAR-Pinger Localizations
icListen hydrophone arrays detect and locate underwater pinger signals from lost vessels, aircraft, and equipment. Their synchronization capabilities and compact design support accurate localization and flexible deployment during search and rescue operations.
Marine Protected Areas
icListen hydrophones support acoustic monitoring in Marine Protected Areas by detecting marine mammal activity, vessel noise, and other underwater sounds. Their real-time monitoring capabilities help assess human impacts and support marine conservation efforts.
Marine Mammal Monitoring
icListen hydrophones capture underwater sounds to support marine mammal detection, monitoring, and research. Their high sensitivity, low self-noise, and acoustic event detection capabilities help researchers study marine mammal activity and underwater soundscapes.
Scientific Research & Discovery
icListen hydrophones capture acoustic data to support research in marine biology, oceanography, and environmental science. Their wide frequency range, low self-noise, and real-time monitoring capabilities help researchers study underwater soundscapes.
Observatories
icListen hydrophones integrate with underwater observatories to provide continuous acoustic monitoring and real-time data. Their high sensitivity and low self-noise support the detection of marine mammal activity, vessel noise, and natural underwater events.
Earthquakes & Tsunamis
icListen hydrophones detect underwater acoustic signals associated with earthquakes, submarine landslides, and other seismic events. Their real-time monitoring and event detection capabilities support oceanographic research and seismic hazard assessment.
Construction Monitoring
icListen hydrophones provide continuous underwater acoustic monitoring during marine construction projects. Their real-time data helps assess noise levels, track environmental impacts, and support regulatory compliance.
Pile Driving & Impact Noise Monitoring
icListen hydrophones capture high-intensity, impulsive underwater sounds generated by pile driving and other impact activities. Their wide dynamic range and precise acoustic measurements support noise assessment and mitigation efforts.
Dredging
icListen hydrophones measure underwater noise generated by dredging operations to assess potential impacts on marine life and surrounding habitats. Their real-time monitoring capabilities support environmental assessments and regulatory compliance.
Environmental Impact Assessment
icListen hydrophones collect underwater acoustic data to assess the environmental impacts of human activities on marine ecosystems. Their high sensitivity and wide frequency range support noise assessments, baseline studies, and long-term environmental monitoring.
Pipeline Leak Detection
icListen hydrophones detect acoustic signals associated with potential leaks in subsea pipelines. Their high sensitivity and real-time monitoring capabilities support early identification of issues and pipeline integrity assessment.
Subsea Asset Inspection
icListen hydrophones support acoustic inspections of subsea infrastructure, including pipelines, cables, and underwater structures. Their sensitivity and wide frequency range help identify unusual sounds that may indicate potential issues.
Machine Health Monitoring
icListen hydrophones monitor sounds produced by underwater machinery to identify changes in equipment performance. Acoustic data can help detect mechanical issues and support preventative maintenance.
Underwater Radiated Noise Measurement
icListen hydrophones measure underwater noise emitted by vessels and other marine equipment. Their calibrated acoustic measurements and wide dynamic range support noise assessments, regulatory compliance, and efforts to reduce underwater noise pollution.