Curt, you kindly wrote:
> If that great merganser recording was made with your usual
setup, then
> I'd say you don't think have a "hole-in-the-middle" problem. The
> transition from left to right sounded perfectly smooth and
seamless to
> my ear. Incidentally, the gentle water landing was great!
>
> You willing to describe your mic setup?
That one might have sounded smooth, but listen to this one
(316k):
http://www.rockscallop.org/jh-050430-nodes.mp3
It seems to get loudest at two nodes that correspond the duck
passing the axis of each mic. It might only be coincidence:
perhaps the bird just adjusted its flight as it passed.
Both examples were recorded the same way -- Two NT1-A
cardioid microphones spaced about seven inches apart angled
out about thirty degrees and with a barrier between. The barrier
is oval, about 13 inches tall, 10 inches deep, 2.5 inches thick,
and made of two pieces of dense fiberglass tile covered with
fleece and a piece of formica sandwiched between. If this
arrangement sounds bizarre, well maybe it is, but the parts were
free and plus I might not really know what I am doing anyway.
Actually the microphones sounded fine without a barrier: this
example was recorded with the NT1-As spaced four inches apart
and angled out 90 degrees with no barrier ( the Rogue River and
a Bullock's Oriole -706k):
http://www.rockscallop.org/ear/JH-040521-RogueRBird.mp3
One thing about using the barrier is it seems to preserve the
stereo field independent of the angle of the microphones. Here
is an example using the barrier with the NT1-As both aimed
straight forward (Pacific Chorus Frogs and a beaver -237k):
http://www.rockscallop.org/jh-050512-nt1a0deg.mp3
I guess I've gone barrier happy, because I am using barriers in
the other two mic arrangements I currently use -- 183s using a
tree as a barrier, and 183s in a Telinga dish with an LP
(Beethoven Concerto N0. 3 in C Minor) as a barrier. For the
183s, I record with a Sony MZ-N707, and for the NT1-As I use a
PMD-670.
-John Hartog
________________________________________________________________________
________________________________________________________________________
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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