Modification for ecm8000 for directional use

[darrin_h2000]

I was wondering if placing a 38" copper (plumbers)coupling over the head of the mic exposeing only the head of the mic may change the directional properties of this mic. from omni to cardioid?

Has anyone tried this or is my mind the only one sick enough to think this up?

 

[Griffinator]

Wouldn't you end up with some rather strange resonant effects out of such a mod?

Presumably, since you're going for a directional application, that you're trying to isolate a specific area - meaning that there's sound coming from other places, right? Wouldn't the sound coming from outside your target range cause reverbation interference on the tube?

Maybe a foam wrap outside of the copper coupling might solve this, but even then you've got to consider the sound bouncing around inside of the copper, right?

 

[darrin_h2000]

Maybe an inch of air hose instead.

 

[Harvey Gerst]

And the correct answer is:



e. None of the above.



An omni is a pressure mic. See the big thread to understand why all of the above ideas won't work.

 

[Randy Yell]

Lets see how my old brain cells work.The omni is a pressure transducer mic so only one side of the diaphragm is exposed to the sound pressure that you are recording.In a pressure gradient mic(like a cardoid) the sound waves work on both sides of the diaphragm so for a cardoid mic you would have to expose the rear of the diaphragm to sound waves not the other way around.Is this close Harvey?

 

[Harvey Gerst]

Not just close, Randy - you're exactly right!!!

 

[Randy Yell]

See Harvey,YOU can teach an old dog new tricks!!

 

[cominginsecond]

Why would you want to modify an ECM8000 to be directional? I figure you've got about a million choices when it comes to low-priced cardiods (V67, C1, mxl603, NT1, NT3, etc.) and maybe two when it comes to omnis (ECM8000 and the new Audio-Technica 3032 or is it the 3031?).

Cherish your ECM8000 and love it for the beautiful mic that it is. This message has been brought to you by the Church of Jesus Christ of Latter Day Saints.

 

[darrin_h2000]

Just dont come to my door dude.