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Re: Riverforks CZM microphones

Subject: Re: Riverforks CZM microphones
From: m_pesente
Date: Fri Aug 18, 2017 2:19 am ((PDT))
I know, CZM Riverforks are rightly protected by a USA patent. However, for =
a personal use, I think possible to "copy" them for their structure and sha=
pe. So, a few years ago, I made two couples of these microphones, using woo=
d and a wood lathe machine. Instead of a Panasonic 61a capsule, as it seems=
 for the original CZM, I inserted a Primo em172 capsule (now so used and ab=
used everywhere!). Far from telling me if the results I had are comparable =
to those with the original CZM, as even a slight variation in the shape of =
the dish can significantly affect (I tested two different shapes) in the fr=
equencies response.=0D
 From a sound quality point of view, I must say that results with the model=
s I built were mediocre. There are more pronunced frequencies in the midran=
ge, in contrast with a significant reduction in low frequencies.=0D
 However, the most impressive thing is the gain in sound signal, comparable=
 to that of a mid size parabola, but with a 360 =B0 effect! So, as Gregory =
said, it can be of some utility for species survey.=0D
 Marco Pesente=0D

"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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