This is influenced by the AKG D45. There is an auction on eBay from Canada showing the inside.
The 2 cardiod capsules are one on top of the other each facing in opposite direction.
So when they are connected in phase together, for example connected in series an omni is created. The uglyer part of the response from the back of each mic is canceled. This was tried with good results on 2 Shure Unidyne B mics, capsules near, mics facing opposite directions. Proximity bass heaviness is canceled. The mic sounds great from both directions. It is no longer a cardiod. It's Omni.
Figure of eight is created by reversing the phase on one mic. Figure of eight is nice too as it cancels everything coming from the sides.
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