C305 Hydrophones

Cetacean Research C305 Hydrophones, shielded versions of the Cetacean Research C304XR with a tougher encapsulation, are available for purchase.

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Cetacean Research™ C305 Hydrophone edge view

The Cetacean Research C305 series hydrophones have a directional receive pattern with very wide frequency response for monitoring ultrasonic signals not detectable by competing brands. The connector is an integral part of the hydrophone. Hydrophones are not individually calibrated but calibrated frequency response measurements can be performed on request.

  • C305 Hydrophone top view
  • Cetacean Research™ C305 Hydrophone edge view
  • C305-ss-locking-sleeve
  • Cetacean Research™ C305 Hydrophone Beam Pattern
  • Cetacean Research™ C305 Frequency Response
  • hydrophone protection cage

C305 hydrophone specifications

C305 / C305X
Linear Frequency Range (±3dB) [kHz] 0.012 to 1200 / 0.012 to 250+
Usable Frequency Range (+3/-12dB) [kHz] 0.005 to 2000+ / 0.005 to 250+
Transducer Sensitivity* [dB, re 1V/µPa] -198
Preamplifier Gain [db] 20 / 33
Effective Sensitivity* [dB, re 1V/µPa] -178 / -165
SPL Equiv. Self Noise at 1kHz [dB, re 1µPa/√Hz] ≈ 63
Power Requirement [Vdc] 5 to 32
RMS Overload Acoustic Pressure [dB, re 1µPa] 182 to 199 / 169 to 186
Maximum Operating Depth ** [m] 920
Operating Temperature Range [°C] -40 to 60
Output Impedance [Ω] 10
Dimensions † [mm] 110L x 38W x (25 to 11)T
Integral Connector **** Subconn MCBH3MSS

*  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.
† length includes the connector pins.

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 the Cetacean Research C305 hydrophone 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


The Cetacean Research C305 replaced the Cetacean Research C304XR

The Cetacean Research C305X replaced the Cetacean Research C304.

View reference information on the Cetacean Research C304 hydrophone series.