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Author Topic: Boundry mic surface question  (Read 1511 times)

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Offline Gutbucket

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Boundry mic surface question
« on: December 19, 2007, 04:19:18 PM »
I'm pretty well versed in how 'boundary mounted' mics (PZM's the obvious example) work and why. I know how the size of the boundary effects the lower limit of the 6dB boost perpendicular to the surface.  The question is, does the 'boundary effect' only work when the surface is hard and reflective?  If the surface is soft or fuzzy does that cancel the 'pressure zone' boost? Only at the frequencies that the surface absorbs?
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Offline Javier Cinakowski

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Re: Boundry mic surface question
« Reply #1 on: December 19, 2007, 04:25:11 PM »
That is a question I am interested in as well.  I think a reflective surface is nessesary to get the boost.  A surface that absorbs will not cause the same cancellation of reflected sound that results in the boost..  I would bet the effect only applies to the frequencies that the surface does not absorb...

In other words, a fuzzy jdisc will not give a boundry boost...
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Offline Gutbucket

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Re: Boundry mic surface question
« Reply #2 on: December 19, 2007, 04:27:17 PM »
That's my half-educated guess too.
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musical volition > vibrations > voltages > numeric values > voltages > vibrations> virtual teleportation time-machine experience
Better recording made easy - >>Improved PAS table<< | Made excellent- >>click here to download the Oddball Microphone Technique illustrated PDF booklet<< (note: This is a 1st draft, now several years old and in need of revision!  Stay tuned)
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