Looked at Aquarian's web site, Charlie, but couldn't anything related
to a stereo unit. Did I miss something? Also, if you're recording
stereo, optimally we've found that one would need approximately a 10m
(33ft) spread between transducers to get a spatial effect equivalent
to the illusion of stereo space one would expect with good
terrestrial recordings. How, from a kayak (unless you have a floating
spreader or two kayaks), do you plan on doing this? In our
experience, because of the density of the medium (water), a spread of
just a couple of feet won't work too well.
Once, when recording and counting migrating bowhead whales off the N.
Slope of Alaska and trying to get a handle on the numbers and
locations, we set up a tetrahedral system. With four hydrophones, we
located three at 10m apart on the surface on buoys, and one below,
suspended equidistant from the others, and captured the sound on a
four-channel recorder. By measuring and charting the slight
differences in arrival times, we were able to get a 3-D image of what
was happening under water with bearded seals and the whales. By
playing back any two channels, the stereo imaging and illusion was
really pretty awesome which is how we arrived at the 10m formula.
Less that that, everything sounded more or less like a two-track mono
recording.
Bernie
Wild Sanctuary, Inc.
P. O. Box 536
Glen Ellen, California 95442-0536
Tel: (707) 996-6677
Fax: (707) 996-0280
http://www.wildsanctuary.com
>--- In Walter Knapp <> wrote=
:
>> > From: "charlieo12345" <>
>> >
>> > I am heading to Baja, sea kayaking with a set of stereo
>>hydrophones going after
>some
>> > neat sounds. Other then dropping them down over the side anyone have =
any
>specific
>> > experience recording that way?
>> >
>> > Any suggestions to get me started would be appreceated?
>>
>> Check the whole system out before you go. And note how just about
>> anything you do will produce noise they record. You'll have to work out
>> how to quiet all that.
>>
>> I'm curious just what stereo hydrophone? I've not seen any adverts for
>> stereo ones.
>>
>> Walt
>>
>
>Thanks everyone for the great ideas! I enjoy the depth of stereo in my nat=
ure
>recordings so I bought two H2 Hydrophones from "Aquarian Audio Products",
>http://www.aquarianaudio.com/products.htm
>Robb there is making me up a special pigtail to connect them to a stereo j=
ack.
>I'll report back how it works.
>
>Charlie
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
>
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