2 Shure Unidyne B 515 cardiod mics were placed with their capsules side by side facing opposite directions. Like how it's done inside an AKG D30, AKG D36 or AKG D45, capsules one on top of the other facing opposite directions. (See photos on an AKG D36 listing currently on eBay.)
Signal path:
male singing 515SB USA
- - WE D163851 1:2 transformer - Sony TC-D5 pro - HD580
voice 515SD MEXICO
The 2 mics were connected in series and in phase. Ie pin 2 of USA mic to pin 2 of XLR out, pin 3 of USA mic to pin 2 of Mexico mic, pin 3 of Mexico mic to XLR out.
When mics are held facing onsite directions the bass heaviness effect disappears as the 2 bass heavy components cancel. Very nice sound. Very natural.
Then electrical phase was changed on one mic to create figure of eight response. Bass was somewhat heavier at very small distance compared to cardiod. But treble was more on figure of eight at larger distance than cardiod. (This experiment has problems as comparisons were done by switching off a mic for cardiod comparison. Impedance drops and LF response increases since they drive the WE transformer). But the figure of eight sound was very nice too at large 1-2 ft distance. Nice and bright.
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