didjcripey
77 posts
Apr 29, 2011
2:24 AM
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Just wondering about design of mic bodies, especially vents.
The EV 606 has a big open port on one side which is supposed to make it 'Noise canceling' in loud environments and help control feedback. According to wikipedia, the idea is that room noise enters the port and acts on the back of the diaphragm, so that: 'Sound that's much closer to the front port than to the rear will make more of a pressure gradient between the front and back of the diaphragm, causing it to move more.equalising sound pressure from room noise at the front, maximising the effect of sound originating in front of the element.'
I've also got a cool old philips bakelite bullet mic which has a chrome ring which rotates to open or close side ports to change it from unidirectional to cardiod. SM 57's and many other modern mics have vents just behind the element. I'm currently customising a Philips EL6031/66 which has vents all down the sides of its small bullet shell (wondering whether to fill them in or leave them as is).
I have also seen pics of some of the green bullet shells which have small vent holes, and read how filling them in will help reduce feedback.
Given that Greg says that the shell has very little effect on the tone of an element, and how we go to such great lengths to get an airtight seal on the gasket I wonder if vents in Bullet shells are a good idea or not.
Any theories?
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Lucky Lester
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