> Perhaps from the dish cavity itself. A little dampening of the
> surfaces of the center divider might eliminate it.
Hi Rob,
I taped a couple foam disks (6 x 1/2") to each side of the barrier,
and tried it out recording some stream sounds. It is still hard to
tell if it helped at all - the nicest and worst sounding recordings of
the session had more to do with my choice of direction than anything else.
>Since your divider extends beyond the lip of the dish,
> that might be a good location to try additional capsules in parallel
> with the focal point capsules. The front ones could be directed ~ 115
> degrees.
One thing I noticed while out testing it last weekend is the position
of the capsules relative to the parabolic focus can make a big
difference in the quality of the sound. Pulling the capsules deeper
into the dish improves the overall balance of qualities in some instances
To understand this a bit more I am using a laser pointer to study dish
reflections. I see a general pattern in how a parabola reflects
off-axis sounds towards the barrier. Wider off-axis angles reflect the
signal deeper toward the back of the dish. But more importantly,
off-axis signals from the opposite side of the barrier that are not
blocked by the barrier reflect out beyond the parabolic focus - the
further off, the further out. To avoid any flip-flop effects from
that, it might be important to keep mic capsules positioned at or
behind the parabolic focus, or else far enough out to be beyond those
opposite-side reflections.
At any rate it will be a while until I try more than two microphones
in my array, but I am enjoying following the progression of Tom's
multi-capsule experiments.
John Hartog
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause
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