I've been using home-brewed mics based on the panasonic wm61a capsule, and am looking to increase its many uses (look at linkwitzlab.com for a great example, scroll down to 'microphone'). The capsul is omni - I'd like to make a cardioid version. There seems to be two possibilities - perforate the back of the capsule. This might only cause bass rolloff though. The other is mounting it on the surface of a large sphere - a 1' diameter sphere might block sounds from one side above about 1k...
Any thoughts? I haven't seen it done, so maybe its not possible.
Any thoughts? I haven't seen it done, so maybe its not possible.