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The Cetacean Research C57 series Hydrophones is a preamplified high sensitivity hydrophone. It is specifically designed for outstanding sensitivity performance through high ultrasonic frequencies while maintaining the lowest self noise and best sensitivity possible. 

Battery boxes are rated NEMA-4X water resistant. Standard signal connection for Cetacean Research C57 hydrophones is through a watertight female BNC connector with gold center contact. The hydrophones are powered by one 9V battery (not included).

The removable cable is specifically designed with a special low noise configuration and has a durable waterblocked polyurethane jacket for prolonged exposure to underwater saltwater conditions. It is more flexible than other cables on the market in order to maintain optimum usability. The cable is integrally molded to a 7,000m depth rated underwater connector. Standard length is 15m and 30m, or custom lengths are available upon request.


Linear Frequency Range (±3dB) [kHz] 0.015 – 45
Useable Frequency Range (+3/-12dB) [kHz] 0.008 – 100
Transducer Sensitivity [dB, re 1V/μPa] -187
Preamplifier Gain [dB] 20
Effective Sensitivity* [dB, re 1V/μPa] -167
SPL Equiv. Noise at 1kHz [dB, re 1μPa/√Hz] 46 (sea state zero)
Power Requirement [Vdc] 5 to 32
RMS Overload Acoustic Pressure [dB, re 1μPa] 171 to 188
Maximum Operating Depth [m] 370
Operating Temperature Range [ºC] -40 to 85
Output Impedance [Ω] 10
Dimensions [mm] See user guide above
Integral Connector Wetmate MCBH3MSS
Directionality Omnidirectional Under 10khz