you mean 3 conductor cable, right?
so, bear with me, this is explaining the cabling running backwards counter to teh aactual signal flow:
from device with balanced input (ad2k/v3/etc), run normal 3 conductors up to the mic, then at the mic, terminate the (-) balanced leg from the cable to ground thru a resistor matching the output impedance of the mic.
thus the mic itself is not balanced, but the cable leading to the mic will be balanced, and reject most all of the inducted noise. again, i will see some rejection, but probably not the full cmrr due to matching.
that said,the mic is spec'd at 15 ohms at 1 khz. im sure its an approximation of sorts should i get a batch of 15 ohm resistors and try the various values with a long mic cable and do some sort of simple test to see how much noise results?
yeah, that was me, but i dont need to use phantom, just wanted to know if there was an adapter circuit that could be built and used close to the mics to allow for longer cable runs
Yes, just use 2-conductor cable, and tie the unused lead across a 30 ohm resistor (or whatever the output impedance of the mic is) to the cable shield on the mic side of the cable.
You will need a differential (balanced input) amp at the other side of the cable to take advantage of that though.