C57 Hydrophones

Our new C57 hydrophones are in production and they sound fantastic!

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New Hydrophone!

Cetacean Research™ C57 Hydrophone

The Cetacean Research C57 hydrophone series is an extra rugged version of our very popular C55 hydrophone; with a shape that allows it to be towed behind a boat with less flow noise. The C57 utilizes a slightly softer polyurethane encapsulation material than the C55, which results in even better underwater acoustic performance.

  • Cetacean Research™ C57 hydrophone
  • Cetacean Research™ C57 hydrophone
  • Cetacean Research™ C57 hydrophone with hydrophone protection cage
  • Cetacean Research™ C57 hydrophone
  • Cetacean Research™ C57 hydrophone

C57 hydrophone specifications

C57 / C57X C57RS / C57XRS
Linear Frequency Range (±3dB) [kHz] 0.015 to 45 0.015 to 50 & 124 to 250+
Usable Frequency Range (+3/-12dB) [kHz] 0.008 to 100 0.008 to 77 & 96 to 250+
Transducer Sensitivity* [dB, re 1V/µPa] -187 -200
Preamplifier Gain [dB] 20 / 33 20 / 33
Effective Sensitivity* [dB, re 1V/µPa] -167 / -154 -180 / -167
SPL Equiv. Self Noise at 1kHz [dB, re 1µPa/√Hz] 46 (Sea State Zero) 61
Power Requirement [Vdc] 5 to 32 5 to 32
RMS Overload Acoustic Pressure [dB, re 1µPa] 171 to 188 / 158 to 175 184 to 201 / 171 to 188
Maximum Operating Depth [m] 370 920
Operating Temperature Range [°C] -40 to 60 -40 to 60
Output Impedance [Ω] 10 10
Dimensions [mm] 116L x 25dia. 116L x 25dia.
Integral Connector *** Subconn MCBH3MSS Subconn MCBH3MSS

*  Transducer Sensitivity + Preamplifier Gain = Effective Sensitivity.
*** Connectors are rated to a depth of 7,000 meters; see below (or to the side) for mating connector and cables.

Shielded Cable Length [m]

  • mating connector molded to 15, 30, or 50 [m] shielded cable
  • other lengths available on a custom order basis
  • cable includes Integral Connector rated to a depth of 7,000 meters.


  • omnidirectional below 10kHz;
  • very directional at high frequencies (e.g., ~15º solid angle at 200 kHz, −3dB);
  • directionality focused in a plane.


  • removable in-line high-pass filter
  • external power supply support
  • hydrophone protection cage
  • replace 20dB preamp with 33dB version
  • custom orders not listed above
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Battery / Connector box

Battery boxes are rated NEMA-4X water resistant. Standard signal connection for the Cetacean Research C57 hydrophone is through a watertight female BNC connector with gold center contact. The hydrophones are powered by one 9V battery (not included) or an optional long-life rechargeable, external power supply.

Signal Output Female BNC connector
Battery Life [hours] > 20
Box Dimensions [mm] 110 long (including connectors) x 90 wide x 50 high