EEVblog #605 – Fig.8 & Cardioid Microphone Patterns

Doug Ford, former head designer from Rode Microphones continues with Part 2 of the microphone technology series by explaining the construction of noise cancelling Figure 8, cardioid, and hyper cardioid microphones. Also, how the polar patterns and responses relate to the physical construction, and how the frequency response is affected.
Proximity boost effect,
Microphone calibration is also discussed using a home made artificial voice speaker box.
And practical considerations about foldback wedges used in stage performances and how to avoid feedback using proper microphone technique.
And did Jimmy Barnes offer Doug a swig from his bottle of Vodka?
Forum HERE

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    • Mike

      Hi Dave and Doug

      Thanks a lot for this interesting eevblog episode. I’m not really big in microphones but it is allways nice to learn something new.

    • Babak

      Excellent series! Doug has a way of breaking down complicated stuff in easily bits – I wish I had such professors back in uni. It was pretty much the reverse then :( Keep this up, both engineers interested in sound and consumers can learn a lot from theis series.

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    • JFA in Montreal

      Is there a way to build / use a sound source box without using a calibration microphone?

    • GMCurrie

      Panasonic WM-61A series capsules are used by lots of experimenters as an inexpensive DIY measurement mic option

    • MLXXXp

      At 13:00 Dave asks if all cardioids are constructed using two physical elements. Doug replies that no, there’s black magic involved. I don’t recall this “black magic” being explained. I’d like to have this explained in the next part, if there is one.

    • GMCurrie

      this freeware impulse/frequency response analysis package might be of interest to those into acoustics

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