Hydrophones
overview of all models
Cetacean Research™ hydrophones are manufactured using superior transducers encapsulated in a durable polyurethane. Cetacean Research Technology (CRT) also carries Sensor Technology hydrophones.
CRT offers both hydrophones and hydrophone systems
Hydrophone Models Summary - compare specs
SQ26-H1B
General purpose hydrophone ideal for kayaking, whale watching and full audio-band signal detection; can also be used as a contact microphone or low cost geophone... more
CR1 series
Excellent multi-purpose non-preamplified hydrophones - great for the detection and recording of both very loud signals and the quieter sounds of cetaceans and other underwater sources.... more
CR2
Ideal for the detection and recording of extremely loud signals. Examples of such loud sources include close-range dolphin echolocation, high-power sonar, large pile drivers ... more
C55, C55RS
Cylindrical hydrophones for detection of audible and ultrasonic sounds, with the addition of an integral connector... more
C57, C57RS
An extra-rugged version of the C55 in a shape that allows it to be towed behind a boat with less flow noise... more
C305
Directional receive pattern with very wide frequency response for monitoring ultrasonic signals not detectable by competing brands... more
Cetacean Research™ Hydrophone Specifications Comparisons
| Model Number | CR1A | CR2 | CR3 |
|---|---|---|---|
| Linear Frequency Range (±3dB) [kHz] | 0.00016† to 48 | 0.0019† to 28 | 0.0004† to 180 |
| Usable Frequency Range (+3/-12dB) [kHz] | 0.00005† to 68 | 0.0005† to 60 | 0.0001† to 240 |
| Transducer Sensitivity [dB, re 1V/µPa] | -199‡ | -214 | -207‡ |
| Preamplifier Gain [dB] | N/A | N/A | N/A |
| SPL Equiv. Self Noise at 1kHz [dB, re 1µPa/µHz] | 38 (< Sea State Zero) | 68 | 54 |
| Power Requirement [Vdc] | N/A | N/A | N/A |
| RMS Overload Acoustic Pressure [dB, re 1µPa] | N/A | N/A | N/A |
| Maximum Operating Depth [m] | 500 | 370 | 980 |
| Operating Temperature Range [°C] | -25 to 60‡ | -40 to 70 | -40 to 90‡ |
| Capacitance [nF] | 10 | 0.82 | 6.7 |
| Dimensions [mm] | 85 L x 32 dia | 56 L x 14 dia | 50 L x 18 dia |
| Coaxial Cable Length [m]* | 15 | 10 | 15 |
| Directionality all are omnidirectional below 10kHz |
- | - | omnidirectional at all frequencies |
| Battery / Connector box | power not required | power not required | power not required |
notes:
† Requires a preamplifier with 100MΩ input impedance, such as the Reson VP1000 or Reson VP2000 preamplifiers, or the USB Dual Pre, which has 330kΩ impedance. If a typical preamplifier with 1MΩ input impedance is used then the following will occur:
| low frequency -3db point will be at |
-20db point will be at |
|
|---|---|---|
| CR1 | 16Hz instead of 0.16Hz | 1.6Hz instead of 0.016Hz |
| CR2 | 200Hz instead of 2Hz | 20Hz instead of 0.2Hz |
| CR3 | 60Hz instead of .6Hz | 6Hz instead of 0.1Hz. |
‡ CR1 series and CR3 hydrophones are individually spot calibrated at the factory; calibration guaranteed between -5°C and 30°C.
CR2 hydrophones are not individually calibrated, but calibrated frequency response measurements can be performed for an additional fee.
* Cable terminated with male BNC connector (longer cable optional)
Cetacean Research™ Hydrophone Specifications Comparisons
| Model Number | C57 / C57X | C57RS / C57XRS | C305 / C305X | C75 / C75X |
|---|---|---|---|---|
| Linear Frequency Range (±3dB) [kHz] | 0.015 - 45 | 0.015 - 50 & 124 - 250+ | 0.012 - 1200 / 0.012 - 250+ | 0.010 - 170 |
| Usable Frequency Range (+3/-12dB) [kHz] | 0.008 - 100 | 0.008 - 77 & 96 - 250+ | 0.005 - 2000+ / 0.005 - 250+ | 0.003 - 250 |
| Transducer Sensitivity* [dB, re 1V/µPa] | -187 | -200 | -198 | -200 |
| Preamplifier Gain [dB] | 20 / 33 | 20 / 33 | 20 / 33 | 20 / 33 |
| Effective Sensitivity* [dB, re 1V/µPa] | -167 / -154 | - 180 / -167 | -178 / -165 | -180 / -167 |
| SPL Equiv. Self Noise at 1kHz [dB, re 1µPa/√Hz] | 46 (Sea State Zero) | 61 | ≈ 63 | 51 |
| Power Requirement [Vdc] | 5 to 32 | 5 to 32 | 5 to 32 | 5 to 32 |
| RMS Overload Acoustic Pressure [dB, re 1µPa] | 171 - 188 / 158 - 175 | 184 - 201 / 171 - 188 | 182 - 199 / 169 - 186 | 184 - 201 / 171 - 188 |
| Maximum Operating Depth [m] | 370 | 920 | 920** | 920** |
| Operating Temperature Range [°C] | -40 to 60 | -40 to 60 | -40 to 60 | -40 to 85 |
| Output Impedance [Ω] | 10 | 10 | 10 | 10 |
| Dimensions [mm] | 116L x 25dia. | 116L x 25dia. | 110L x 38W x (25-11)T | 92L x (25-18)dia. |
| Integral Connector *** | Subconn MCBH3MSS | Subconn MCBH3MSS | Subconn MCBH3MSS | Subconn MCBH3MSS |
| Directionality all are omnidirectional below 10kHz |
very directional
at high frequencies (e.g., ~15° solid angle at 200 kHz, –3dB); directionality focused in a plane. |
very directional at high frequencies (e.g., ~15° solid angle at 200 kHz, –3dB); directionality focused in a plane. |
very directional at high frequencies (e.g., ~15° solid angle at 200 kHz, –3dB); directionality pattern is a dipole. |
omnidirectional at all frequencies |
| Battery / Connector box**** |
yes | yes | yes | yes |
notes:
** 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.
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.
Options
- removable in-line high-pass filter
- external power supply support
- hydrophone protection cage
- C57 and C305 series hydrophones are not individually calibrated; calibrated frequency response measurements can be performed for an additional fee
- custom orders not listed above
**** Battery / Connector box
Battery boxes are rated NEMA-4X water resistant. Standard signal connection for the Cetacean Research™ C57, C75, and C305 series hydrophones 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 |
