Re: Rode NT1A modification

[grickerd]

Re: modifying an omni EM172 omnidirectional capsule for cardioid pattern...
In my limited reading, my impression is that could be a little tricky.

I also note that on the Primo website they list a unidirectional capsule with 
identical dimensions and electrical characteristics as the EM172.  It has 
perforations visible in the rear PCB plate.... the EM182.

However the EM182 has a much poorer frequency response curve, and is an 
electrical 3-wire hookup more like the EM173.  Data sheets here:  
http://www.primomic.com/ http://www.primomic.com/

I wonder if there is a lot more to creating a true cardioid mic pattern than 
perforating the rear of the capsule, such as rear porting on the microphone 
body, acoustic damping on the capsule mount, &c.

I agree it's a fascinating subject.  

Glen Rickerd
Electrical engineering background, nature recording wanna-be