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Cetacean Research Technology C75

The Cetacean Research C75 is a preamplified, spherical hydrophone designed for the detection of low frequency, audible, and ultrasonic sounds. It is omnidirectional.
The Cetacean Research C75 Hydrophone has an omnidirectional receive pattern with very wide frequency response for monitoring up to ultrasonic signals.

The connector is an integral part of the hydrophone. Hydrophones are not individually calibrated but calibrated frequency response measurements can be performed on request.
Specifications for the C75 / C75X
Linear Frequency Range (±3dB) [kHz]: 0.01 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]: 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 [ºC]: -40 to 85
Output Impedance [ohm]: 10
Dimensions [mm]: 92 L x 25 to 18 dia
Integral Connector: Subconn MCBH3MSS
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Battery / Connector box
Battery boxes are rated NEMA-4X water resistant. Standard signal connection for the Cetacean Research C75 hydrophone is through a watertight female BNC connector.
The hydrophones are powered by a single 9V battery (not included).
Signal Output: Female BNC connector
Battery Life [hours]: > 20

*  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.

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.

Directionality: omnidirectional
  • removable in-line high-pass filter
  • external power supply support
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