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Re: question on infrasound recordings

Subject: Re: question on infrasound recordings
From: "stoatwizard" stoatwizard
Date: Fri Jun 30, 2006 11:54 am (PDT)
Hi Ilse,

Perhaps more one for the phonography list on

The item used in the project you are referring to was a contact mic -
a wood picker, not

these usually want to see a very high impedance input of 1Megohm or
more if you want to keep low frequencies - most are piezoelectric
elements which are cheap enough. You can DIY this

Getting a high-impedance input and a recorder with a low enough LF
cut-off will be the challenge. With a contact mic unless you are
using the bending of an instrument soundbox you will also need a
large mass to act as the counterpoise.

For picking up infrasound propagated through the air you need to use
an omnidirectional mic. Directional mics tend to have a poorer LF
response by their nature. City low frequency noise is so loud you'd
probably get away with an omni electret capsule.

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