Read our peer-reviewed article "Our Sonic Pathways".
The Cetacean Effect
The marine environment beyond imagined
We go boating to be out in nature because of the feeling it gives us, that feeling of oneness with our environment. Using this system we can enjoy a dimension that was previously unavailable to us. Marine cetaceans (whales and dolphins) produce sounds that are rich in hypersonic frequencies (Above the human hearing limit of 20,000 Hz) which studies have shown to produce deep activation of the brain.1 Boaters have the unique opportunity to hear these sounds in their natural environment and in their entirety with this product, as opposed to only the limited frequencies standard audio equipment is capable of reproducing. Standard audio equipment only encompasses sounds within- or very near the range of human hearing, truncating these rich and varied components that, although they do not create an auditory experience, have been shown to have clear effects on human physiology. Our studies over the last 25 years into the effect of sound on the human organism have brought us to the point where we can now offer a very specific enhancement to the marine experience.
How does it work?
The sounds are captured by a high sensitivity transducer (hydrophone) and played back live. The frequencies captured and played back go all the way up to 120,000 Hz. To achieve this the audio is divided into two components, high and low, each with it's own Amplifier and Speakers particularly suited to that range of frequencies. The transducer is either lowered into the water by a mounting system on the transom, or via a thruhull mount.
Please Contact Seattle Boatworks For More Information
 Oohashi T. et al.: High frequency sound above the audible range affects brain electric activity and sound perception, AES 91st Convention Preprint 3207, 1-25, 1991.
 Yagi R. et al.: Multidisciplinary evaluation on the hypersonic effect with the Authentic hypersonic sound systems (in Japanese), Proc. 2001 autumn meeting of Acoustical Society of Japan, 527 – 528, 2001.
 Oohashi T. et al.: Inaudible high-frequency sounds affect brain activity: hypersonic effect, Journal of Neurophysiology 83: 3548-3558, 2000.
best suited to sailboats, this system can also be used in power boats,
but they must be stationary because of engine and
propeller noise. It is not recommended for sailboats under 35 feet because of small
overall listening space.
spectrum hydrophone (1 Hz to 120,000 Hz range)
4. Low Frequency Component Amplifier and Speakers
5. High Frequency Component Amplifier and Speakers (thin film technology)
6. Oxygen free copper cabling
of a typical system: $4500
or thru hull mountings are available.
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