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
Linear Frequency Range (±3dB) [kHz] 0.011 to 85+
Usable Frequency Range (+3/-20dB) [kHz] 0.003 to 230+
Transducer Sensitivity [dB, re 1V/µPa] -206
Preamplifier Gain [dB] +20 (by default), +33 (on request)
Effective Sensitivity* [dB, re 1V/µPa] -186 (Effective Sensitivity = Transducer Sensitivity + Preamplifier Gain)
SPL Equiv. Self Noise at 1kHz [dB, re 1µPa] 57
Power Requirement [Vdc] 5 to 32
RMS Overload Acoustic Pressure [dB, re 1µPa] 190 to 207
Maximum Operating Depth [m] 250 (1000 m versions are available)
Operating Temperature Range [ºC] -40 to +60
Output Impedance [Ohm] 10
Dimensions [mm] 101 Length x 25 to 18 Diameter
Integral Connector Subconn MCBH3MSS
Shielded Cable Length [m] mating connector molded to 15, 30, or 50 [m] shielded cable, other lengths available. Cable includes Integral Connector rated to a depth of 7000 m.
Directionality Omnidirectional

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
Box Dimensions [mm]: 110 long (including connectors) x 90 wide x 50 high

C75 Hydrophone

C75 Hydrophone Frequency Response

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