Cetacean Research™ Hydrophone Specifications Comparison
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| Model Number |
C55 |
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C55RS |
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 C75
preliminary
specifications |
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C304 |
| Linear Frequency Range (±3dB) [kHz] |
0.016 to 44 |
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0.016 to 50 & 122 to 250+ |
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0.010 to 125 |
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0.007 to 250+ |
| Useable Frequency Range (+3/-20dB) [kHz] |
0.006 to 203 |
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0.006 to 82 & 92 to 250+ |
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0.005 to 250 |
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0.005 to 250+ |
| Transducer Sensitivity* [dB, re 1V/µPa] |
-185 |
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-200 |
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-205 |
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-203 |
| Preamplifier Gain [dB] |
20 |
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20 |
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20 |
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34 |
| Effective Sensitivity* [dB, re 1V/µPa] |
-165 |
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-180 |
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-185 |
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-169 |
| SPL Equiv. Self Noise at 1kHz [dB, re 1µPa] |
42 (< Sea State Zero) |
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58 |
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53 |
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~ 63 |
| Power Requirement [Vdc] |
5 to 32 |
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5 to 32 |
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5 to 32 |
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5 to 32 |
| RMS Overload Acoustic Pressure [dB, re 1µPa] |
169 to 186 |
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184 to 201 |
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189 to 206 |
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173 to 190 |
| Maximum Operating Depth ** [m] |
460 |
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460 |
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250 |
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460 |
| Operating Temperature Range [ºC] |
-40 to 60 |
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-40 to 60 |
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-40 to 60 |
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-40 to 60 |
Output Impedance [ ] |
2.5 |
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2.5 |
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2.5 |
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2.5 |
| Dimensions [mm] |
119 L x (25 to 16) dia. |
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119 L x (25 to 16) dia. |
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101 L x (25 to 18) dia. |
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83 L x 32 W x (25 to 6)T |
| Shielded Cable Length [m] |
mating connector molded to 15, 30, or 50
(other lengths available on a custom order basis)
cable includes Integral Connector (Subconn MCBH3MSS) rated to a depth of 7,000 meters. |
Directionality
all are omnidirectional below 10kHz |
very directional at high frequencies (e.g., ~15º solid angle
at 200 kHz,  3dB); directionality focused in a plane. |
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omnidirectional at all frequencies |
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very directional at high frequencies (e.g., ~15º solid
angle at 200 kHz, 3dB); directionality pattern is a dipole. |
| Battery / Connector box
rated NEMA-4X water resistant, requires
single 9V battery (not included)
9V battery life > 20 hrs |
standard signal connection is through a watertight female BNC connector
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optional removable in-line high-pass filter |
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wire battery box to accept power from external supply |
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* Transducer Sensitivity + Preamplifier Gain = Effective Sensitivity.
** 1,000 meter versions of the C55, C55RS, C75, and C304 hydrophones are available. Append "-1k" to the model number to order a hydrophone with a depth rating >1,000 meters.
C55 series, C75, and C304 Hydrophones are not individually calibrated, but calibrated frequency response measurements can be performed upon request. |
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