I was asked off-list for some more info on the recording, it may be of inte=
rest to the group so I have copied my reply below.
Ross
Of course, ask away...
The plans I followed are these from Rob D. He has designed two versions, th=
is link is to the smaller one, the one I made.
https://pantherfile.uwm.edu/type/www/audio-reports/BoundaryMicExperiments/i=
mages/PBB2N-Plans_SASS-LikeDimensionsSept2010.gif
If you look around on the site you will find a huge amount of information v=
ery generously supplied by Rob and other members of this group.
The em172 capsules were bought from the Frogloggers site, 10x caps for abou=
t =C2=A380, excellent service.
I have added a permanent wind screen around mine, (ie stetched lycra tights=
from my local pound shop) with a handful of duck down between the mics and=
screen.
Without this I found the mics far too sensitive to air movement to be useab=
le outdoors.
I also used a preamp BMA2
http://www.micbooster.com/products/felbattpreamp.html
This is not actual needed to run the capsules, they work on the low pip tha=
t the Sony M10 provides but I decided to give it a try.
The preamp supplies a higher voltage to the 4x capsules I hoped the mic's p=
erformance might improve if they were being supplied something closer to th=
eir rated operating voltage.
My impression is that using the pre-amp gives a fuller sound, ie more lower=
frequencies but I have not done a proper test.
To make my recording I waited for a combination of things ie. high spring t=
ide, a large swell, very little wind and a day off work to get there.
I had the mic array on a 2-3.0m boom which I was holding about 1.0-1.5m abo=
ve the surface.
I experimented with this position to try and balance the sound of the swash=
with the sound of the surf, otherwise the roar from the surf dominated the=
overall sound.
I was using the boom to get the mics far enough out so that the waves washe=
d right past me and the mics before receding, this effect is clearly heard =
as the wave passes from right to left.
The mics were positioned so that right =3D towards the sea, left =3Dtowards=
the land, this is probably different to the way you had yours.
I found that keeping the mic quite close to the surface and not using a lo-=
cut filter gave the best result.
Hope this helps,
Thanks, Ross
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