Just checking back to see if you'd changed your schematics, but not yet. In the process, I realized that I didn't pay very close attention to your 9V schematic. What exactly is R6 supposed to be doing? Loading down the capsule is all as far as I can see. And you should supply the 9V (across a diode) to the R2/C1 junction instead of straight to the capsule. That way you don't unbalance the microphone output, which is what happens the way you have it drawn.
Oh, and on your parts list, none of these resistors need to be 1/2W. 1/8W will do just fine.
Some answers for your forum:
mic + goes to XLR pin 3 because the signal is inverted off that pin of the capsule (the FET drain). The "ground" pin of the capsule is the FET source, that is noninverted. So if you want to maintain proper polarity of the signal, you need those connections as shown.
HOWEVER, there are a few capsule models out there which bizarrely enough are reverse polarity. There aren't many, but it's always worth a test to ensure you have polarity for that capsule correct.
And the zener diode is indeed a regulator (in correct orientation). It will let enough current flow through it to keep its cathode (reverse wired) 12V above its anode. Given the 22K resistors, 6k8 phantom resistors, and 48V, that's (48-12) / (14400) = 2.5mA. The capsule will draw around 0.5mA, so that's 2mA loss through the zener. Sounds wasteful, but it allows the mic to stay at the regulated 12V at lower phantom supply voltages.
If you wire it the wrong way it will act as a regular diode, which is to say you'll have a power rail of 0.6V, for a current of 3.3mA. The capsule won't be very happy that low, so I expect you've wired it correctly but drawn it incorrectly.
