We never used barriers, Walt, especially when we were recording w/
tetrahedral systems with 10m spacing between all transducers.
Deriving sound from any two tracks horizontal to the surface, the
stereo imaging was pretty terrific (for example, hear Cut 1 about 10
minutes into the track, of "Ocean Dreams."). We've gots about 150
hours of other examples, as well. Hmmmm...
Bernie
>From: Wild Sanctuary <>
>>
>> Sound travels about 5 x faster in water (approx. 1100ft/sec in air
>> and 5000 ft/sec in water, depending on salinity and temperature),
>> Charlie, and has very different transmission properties because of
>> the density of the medium. Given our experience, my guess is that a
>> three foot spread ain't gonna work very well. You'll need more.
>
>Head spaced stereo setups, which is what we are talking about, have a
>barrier to represent the meat in our head, without that they don't get
>much stereo either. To duplicate that in hydrophones it would be
>necessary to provide a barrier. I expect if a equivalent acoustic
>barrier could be designed that they would work at the closer distance.
>Not sure about the appropriate material, many barriers in air are not
>barriers in water.
>
>Otherwise you are duplicating spaced omni's with no barrier and the 10
>meters sounds in the ballpark for duplicating those.
>
>Walt
>
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
>
--
Wild Sanctuary, Inc.
P. O. Box 536
Glen Ellen, California 95442-0536
Tel: (707) 996-6677
Fax: (707) 996-0280
http://www.wildsanctuary.com
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