C75 Hydrophone

The Cetacean Research C75 series Hydrophones are our preamplified omnidirectional hydrophone.

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Cetacean Research™ C75 Hydrophone
  • Cetacean Research™ C75 hydrophone
  • Cetacean Research™ C75 hydrophone with cable and battery box
  • Hydrophone Protection Cage
  • Frequency Response graph for C75
  • Cetacean Research™ C75 hydrophone beam - horizontal
  • Cetacean Research™ C75 hydrophone beam - vertical

C75 hydrophone specifications

C75 / C75X
Linear Frequency Response Range (±3dB) [kHz] 0.010 to 170
Usable Frequency Range (+3/-12dB) [kHz] 0.003 to 250
Transducer Sensitivity* [dB, re 1V/µPa] -200
Preamplifier Gain [db] 20 / 33
Effective Sensitivity* [dB, re 1V/µPa] -180 / -167
SPL Equiv. Self Noise at 1kHz [dB, re 1µPa/√Hz] 51
Power Requirement [Vdc] 5 to 32
RMS Overload Acoustic Pressure [dB, re 1µPa] 184 to 201 / 171 to 188
Maximum Operating Depth ** [m] 920
Operating Temperature Range [°C] -40 to 85
Output Impedance [Ω] 10
Dimensions [mm] 92L x (25 to 18)dia.
Integral Connector† Subconn MCBH3MSS
Directionality omnidirectional
*  Transducer Sensitivity + Preamplifier Gain = Effective Sensitivity.
**  1,000 meter versions are available. Append "-1k" to the model number to order a hydrophone with a depth rating >1,000 meters.
*** 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.


Battery / Connector box

Battery boxes are rated NEMA-4X water resistant. Standard signal connection for Cetacean Research C75 hydrophones 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