Aloha Nature recordists, I pick up this thread from a few weeks ago, having
finally gotten out in a two-man sea kayak as I had planned. We headed out South
from Kaua'i and I dropped the 'phones in about 300 feet of water about 2 miles
out. Here is a condensed and stitched together sample of my result--
http://soundshawaiian.com/mp3/Hump%20more%20condensed%20Mixdown.mp3
or http://tinyurl.com/ykrqr9l
A very exciting time it was. I got about 45 min of this conversation, not sure
how far away the animals were, though we saw adults within 200 meters.
You can hear other whales more distant.
Gear: Sony D50, ART Phantom II power supply, Aquarian H2a XLR Hydrophones with
10 m cables from Rob Nichols. I didn't dare take my SD 702 for fear of water
damage.
Precautions: I kept the gear enclosed in a zip-loc inside a waterproof dry-bag
until conditions felt right. Then worked the controls inside the dry bag. All
worked well until the wind picked up and I had to close up again, especially
working back upwind as the wind turned off-shore. I'm going out again, this
time to drift down-wind a few miles.
Post editing included 20db lowcut (recording was done without low cut), 10 db
cut above 2500hz, and several passes to reduce hiss.
I like these new XLR hydrophones very much. I may need longer cables to get
deeper, as I think a lot of the hiss is from surface noise, and maybe some
distant snapping shrimp. The mics are quieter in self-noise than this recording
indicates.
Next time I'll also spread the phones more by suspending from bow and stern,
about 16 feet, whereas this time the spread was only 6 feet.
I see a lot of hydrophone recording in my future, adding another dimension to
my Hawai`i soundscape collecting. Really fun!
Aloha,
David
--- In "Kawika" <> wrote:
>
>
> Yes Grant, you have discovered the Snapping Shrimp, bane of shallow water
> marine recordists. Same in Hawaii, maybe the whole planet. It's fairly
> broad-band , can't get it out, or at least I haven't found a way. It is said
> that you need deeper water, say over 30 meters. I'll soon find out, as I'm
> going out in a kayak to test it out, while the Humpbacks are here in great
> numbers.
> Aloha,
> David
> --- In "jasonpudd" <jasonpudd@> wrote:
> >
> > Grant,
> >
> > Done in salt water? The clicking sounds are a species of shrimp.
> >
> > Jason
> >
> > --- In "Grant Finlay" <grantfinlay@>
> > wrote:
> > >
> > > Managed to fix the issues I mentioned, here's a recording from
> > > under Kerikeri River this morning. If anyone can tell me what we are
> > > hearing I'd be very grateful...
> > >
> > > http://tinyurl.com/hydrophone001
> > >
> > > Regards,
> > > Grant.
> > >
> >
>
|