C56 Hydrophone

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Cetacean Research™ C56 Hydrophone

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.

  • Cetacean Research™ C56 modular hydrophone.
  • C56 with battery box input side showing
  • C56 with battery box output side showing
  • Cetacean Research™ C56 shown inline with cables
  • 3D drawing of the Cetacean Research™ C56 modular hydrophone.
  • TASCAM DR-680

C56 hydrophone specifications
Linear Frequency Range (±3dB) [kHz] 0.015 to 45
Usable Frequency Range (+3/-12dB) [kHz] 0.008 to 100
Transducer Sensitivity* [dB, re 1V/µPa] -187
Preamplifier Gain [dB] 20
Effective Sensitivity* [dB, re 1V/µPa] -167
SPL Equiv. Self 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] 460
Operating Temperature Range [°C] -40 to 60
Output Impedance [Ω] 10
Dimensions [mm] 165L x 25dia.
Integral Connector *** Subconn MCBH8MSS & MCBH8FSS

*  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 connectors molded to customer-specified cable length.
  • 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.



Battery / Connector box

Battery boxes are built to meet the customer's requirements and are rated NEMA-4X water resistant. Standard signal output connections for the Cetacean Research C56 hydrophones are through watertight female BNC connectors with gold center contact. The hydrophones are powered by 9V batteries and can also be configured to use larger 12VGel Cell batteries.

Signal Output Female BNC connector
Maximum Channels Six (6)
Battery Life [hours], Box Dimensions [mm] Depends on number of hydrophones

TASCAM DR-680 recorderTASCAM HS P82 multi track recorder