pez, I need to say with all due respect that unfortunately, most of the answers that have been given here are incorrect because they assume that there is one type of adapter or way of connecting the microphones that works for any and all microphones. Given the variety of output circuits used in microphones, that's simply impossible. Probably the single most widely applicable technique would be to use transformers, but you may well prefer some other approach.
Phantom powering is defined for balanced microphones and cables only. That is the standard (DIN EN 61938)--it relies on having two audio leads per microphone that are electrically independent of the cable shield. So the phantom powering would be no different from usual: You'd connect the balanced outputs of your microphones via balanced cables to the balanced inputs of the phantom power supply.
The next part is where things get dodgy: unbalancing the signal at the inputs to your recorder. The only approach that always works is to use transformers. Unfortunately the good ones (Jensen, Lundahl, possibly Beyer) aren't cheap, but they will certainly do the job; not only will they unbalance the signals nicely, but they'll also protect the inputs of your recorder from the 48 Volts DC which may very well be present at the output of your phantom power supply.
Other than that, you'd really have to ask AKG what works best (or what works at all) for your particular series of microphone. Sometimes it's best to ground pin 2 and use pin 3; on the other hand that sometimes gives you nothing but a scratchy, far-away signal, so you ground pin 3 and use pin 2 instead--but then sometimes that will damage the microphone or cause it to distort at far lower sound pressure levels than it could normally handle, so you might use pin 2 and leave pin 3 "floating" (unconnected) but some times it's the other way around. Sometimes resistors and capacitors are recommended. Each type of microphone output circuit has different requirements, or have I mentioned that already?
The penalty for using a generic approach is that some microphones will give you no signal (or very, very little and it'll be noisy), while others will be damaged, and still others will work when you talk into them at normal levels but will run out of headroom more easily than you are used to--sometimes far more easily. The same manufacturer may very well have different models which require their outputs to be unbalanced in different ways from each other--the example I most often give of that is Neumann (the KM 140 vs. the KM 184, for example) although Schoeps also has some models that you unbalance one way and others that you unbalance a different way, and I'm sure that AKG does also. So ... ask them.
--best regards
Topic: Correct way to run Phantom Power > Miniplug 1/8" (Read 3056 times)