The Cetacean Research™ C57 hydrophone series is an extra rugged version of their very popular C55 hydrophone; with a shape that allows it to be towed behind a boat with less flow noise. The C57 utilizes a slightly softer polyurethane encapsulation material than the C55, which results in better underwater acoustic performance.


C57 / C57X C57RS / C57XRS
Linear Frequency Range (±3dB) [kHz] 0.015 to 45 0.015 to 50 & 124 to 250+
Usable Frequency Range (+3/-12dB) [kHz] 0.008 to 100 0.008 to 77 & 96 to 250+
Transducer Sensitivity* [dB, re 1V/µPa] -187 -200
Preamplifier Gain [dB] 20 / 33 20/33
Effective Sensitivity* [dB, re 1V/µPa] -167 / -154 -180 / -167
SPL Equiv.Self Noise 1kHz [dB, re 1µPa/√Hz] 46 61
Power Requirement [Vdc] 5 to 32
RMS Overload Ac. Press. [dB, re 1µPa] 171 to 188 / 158 to 175 184 to 201 / 171 to 188
Maximum Operating Depth [m] 370 920
Operating Temperature Range [°C] -40 to 60 -40 to 60
Output Impedance [Ω] 10
Dimensions [mm] 116L x 25dia.
Integral Connector *** Subconn MCBH3MSS


* 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.

Do not forget to order the cable and the battery box you need.