wild guide: sound underwater
TEST 4
subject: VOICE - talking
In my introduction, I referred to people
who ask other fishermen around them not
to speak so as not to scare the fish. Take a
minute and try to remember if someone
has told you that. If so, tell yourself that
the person in question only wanted to have
a certain peace of mind because, in reality,
in all four diving conditions, Daniel heard
nothing. So a score of 0/10 for all four trials.
I personally believe that the vast majority
of fishermen, including myself, believed
that this could really upset the prey we were
trying to thwart. But it was quite otherwise.
The positive side of this point is that those
who really wanted to have peace and enjoy
a calm and serene environment had a big
argument not to be disturbed.
5 FEET
10 FEET
TEST 6
subject:
PORTABLE
STEREO
Many people like
to listen to the
radio when they
fish. As we have
shown, the sound
and words that
are emitted in the
air do not have an
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www.polkaudio.com
impact underwater.
However, a speaker
can have a different
impact. If you use a portable radio, place
it on a seat or on an insulating material
such as a bag, sweater or coat and there is
no problem. If you place it directly on the
console or on the gunwale, you may be
attracting attention. In this low-intensity
test, a score of 1.5/10 at 5 feet was obtained
and none for the other tests.
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20 FEET
10 FEET
20 FEET
20 FEET
20 FEET
TEST 8 subject: LIVE WELL
The majority of medium to large fishing
boats are equipped with a live well. This is
equipped with a pump which provides the
water necessary for the survival of the fish
and also circulates the water to generate
oxygen. But can you hear this pump
underwater? Our tests were carried out in
a large fishing boat, the Lund Pro V 1975,
with carpet and vinyl. This craft is well
insulated and soundproofed, so if that’s
not the case for your boat, you will have
to extrapolate and inflate the data. Even
with this insulation, the diver could clearly
hear an electric pump noise. At 5 feet, he
rated a 3/10 and a 1.5 / 10 for the 10-foot
depth. For the other two events at 20 feet,
he awarded a score of 0/10.
5 FEET
10 FEET
TEST 5
subject: VOICE - shouting
If the simple sound of the voice can not
be heard by a person under water, it is
certainly otherwise if one shouts. Well,
no! The sound of a person speaking or
yelling travels through the air and not into
the water. Surprising as it may seem, our
frogman (who has no hearing problems)
reported 0/10 scores for each test stage.
Daniel explained that in diving under
water, if you look someone in the face at
a short distance and speak to him, you can
vaguely hear what he is trying to say. In this
situation, the sound comes from and only
travels under water over short distances.
But above the surface...absolutely nothing. TEST 7
subject: ONBOARD STEREO
In this part of our experiments, we did
the same test of the radio, but this time
with the powerful on-board sound system,
equipped with built-in speakers, with
rhythmic music playing rather loud. At
5 and 10 feet deep, Daniel heard a very
distinct humming sound. He gave the
respective marks of 3/10 and 1.5/10. In the
20 foot positions, he could not hear it. For
fish in shallow waters, this kind of sounds
leaves no doubt about the presence of the
human. TEST 9 subject: BILGE PUMP
Bilge pumps are found in several types of
boats. They allow users to empty water that
may have accumulated in the hold. The
results were identical to those obtained for
the 8th test, with a livewell pump. It must
therefore be concluded that when fishing
in shallow water, it may be advisable not to
use them too often so to avoid to frighten
the species sought.
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47 Wild Guide
. Fall 2017
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