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Hydrophones

Ambient Hydrophone ASF-G

ASF-G – Enclosure Hydrophone, the professional Ambient enclosure mounted Hydrophone. The ASF-G Hydrophone is...
Price
$324.00
Availability: Usually ships in 1-2 weeks, on request only, no refunds

Ambient Hydrophone ASF-G XLR

ASF-G – Enclosure Hydrophone, the professional Ambient enclosure mounted Hydrophone. The ASF-G Hydrophone is...
Price
$398.00
Availability: Usually ships in 1-2 weeks, on request only, no refunds

Ambient Hydrophone ASF-G EPIC

ASF-G – Enclosure Hydrophone, the professional Ambient enclosure mounted Hydrophone. The ASF-G Hydrophone is...
Price
$420.00
Availability: Usually ships in 1-2 weeks, on request only, no refunds

Underwater Acoustics

The acoustic underwater differs in many ways from the airborne sound we are used to. The sound velocity underwater is varying between 1450 and 1550 m/sec depending on temperature, salinity and depth. This results in 4 to 4.5 times bigger wave lengths as well as in a special sound phenomenon called the SOFAR, also known as Underwater Sound Channel. Horizontally sound can travel over huge distances whereas vertical propagation is strongly attenuated.

Here are some useful advices:
  • Sound Channels (USC, SSC,…) can be avoided by knowing their local depth
  • To avoid the noise from braking waves on the boat hull, take long enough cables to go down deep enough or prepare to record in greater distance to the vessel.
  • Take time for detailed micro-phasing when recording in pools or artificial environments as bigger wave lengths underwater lead to greater distances between sound maxima and minima.
  • Never forget how far low frequencies can spread underwater. Therefore, avoid touristic areas for documentary shots.
  • Water owns a reflection factor close to 1, thus, airborne sound virtually can’t couple directly into water. This phenomenon can be used, if barriers reach close to the water surface (reefs, wave-breakers, e.g.) you can use them as acoustic barriers, independent of the current depth. This way you may find acoustic cover in a pool with 1m depth behind an 80 cm wooden block, even though the wavelength underwater wouldn’t suggest this.