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Resonance in dynamic microphones
Old 25th August 2020
  #1
Gear Maniac
 
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Resonance in dynamic microphones

Ignore this...

I found the answers I was looking for in Eargle’s Microphone book, but I cannot find how to delete this post/thread!

Last edited by Simmosonic; 25th August 2020 at 05:22 AM..
Old 25th August 2020
  #2
Lives for gear
Quote:
Originally Posted by Simmosonic View Post
Ignore this...

I found the answers I was looking for in Eargle’s Microphone book, but I cannot find how to delete this post/thread!
Why let a good opening line go to waste .... ? Maybe that's why the Shure SM57 is such a universal all-rounder !
Old 25th August 2020
  #3
Lives for gear
Well, there can be a few resonances:

- The fundamental spring (diaphragm compliance) mass (diaphragm + coil mass) resonance is typically close to the bottom of the frequency range for dynamic mics. It also seems to be where the peak of the proximity effect lies in most cases.

- I've also noted a few other resonances, through the kHz range. The EV RE320's capsule has a strong resonance around 5kHz. Despite EV's rather extensive filtering, they didn't attenuate that as much as I'd like. So, I came up with my own circuit in the form of an LCR notch filter which gives a nice flat kHz range: https://www.grimshawaudio.com/re320mods

If you measure the microphone's impedance curve in the same way as you would a speaker, you can find lots of useful information.

Chris
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