Cetacean Research™ C56 modular hydrophones are intended to be connected to as many as five other C56 hydrophones (for a total of 6 channels) on a single cable to form an easy-to-use array. They are an inline version of the Cetacean Research™C55 hydrophone.

These preamplified, cylindrical hydrophones are designed for the detection of infrasonic, audible, and ultrasonic sounds. In addition to typical underwater use, these hydrophones can also be used for the detection of airborne and subterranean sounds and vibrations.

C56 hydrophones include two integral connectors each and are manufactured using superior piezoelectric transducers encapsulated in a very rugged polyurethane. The hydrophones are not individually calibrated but calibrated frequency response measurements can be performed on request.

Linear Frequency Range (±3dB) [kHz] 0.015 to 45
Usable Frequency Range (+3/-20dB) [kHz] 0.008 to 100
Transducer Sensitivity [dB, re 1V/µPa] -187
Preamplifier Gain [dB] +20  
Effective Sensitivity* [dB, re 1V/µPa] -187 / -167 
(Effective Sensitivity = Transducer Sensitivity + Preamplifier Gain)
SPL Equiv. Self Noise at 1kHz [dB, re 1µPa] 46 (Sea State Zero)
Power Requirement [Vdc] 5 to 32
RMS Overload Acoustic Pressure [dB, re 1µPa] 171 to 188 
Maximum Operating Depth [m] 460 
Operating Temperature Range [ºC] -40 to +60
Output Impedance [Ohm] 10
Dimensions [mm] 165 Length x 25 Diameter
Integral Connector  Subconn MCBH3MSS & MCBH8FSS

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

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.
The hydrophones are powered by a single 9V battery (battery not included).
Signal Output: Female BNC connector
Battery Life [hours]: > 20
Box Dimensions [mm]: 98 long x 64 wide x 40 high

C56 Hydrophone

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