Bernie, I appreciate the insight that comes with your experience (and
same to you, Mitch). But I 'm curious: What do you mean when you say
"at the surface" for the three hydrophones. If you're very close to the
surface, it would seem like you'd accentuate noise from waves and the
support structure as well as limiting low frequency response.
On 7/21/2010 4:11 PM, Bernie Krause wrote:
>
>
> For minimal and decent stereo effect we experimented for about a year
> and ultimately determined that a 10m (33 ft) spread between
> transducers was a good start. And since sound doesn't travel in the
> density of marine media as it does in air, it is probably best -- if
> one is interested in capturing a sense of space -- to set up a
> tetrahedral (four channel) system with three set in an equilateral
> triangle at the surface and one h-phone below. That way (from the
> relative arrival times at each transducer) you can pinpoint direction
> of the source(s).
>
>
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