View single post by ArizonaEvp
 Posted: May 23rd, 2013 08:27 AM
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Joined: Jun 26th, 2009
Location: Heart Of Arizona Indian Country, Arizona USA
Posts: 662
Hi Frank,

Here's a short AtransC article on Precursor Sounds. They include pops, clicks, knocks and the sonic boom types that you describe and are usually followed by an evp although I have recorded mini booms that upon review...were the evp.

If you find the sound you mention, please consider uploading a sample.

Take Care & Good Luck,