Hi, Steve. Let me try to answer your questions. 
1. The at 822 is the mic with the rol-off switch, the first mic you had that 
got stolen. This mic only, 
and I underline the word only, accepts battery power, so don't use it with 
phantom power.
The second mic is the at 825, which I think also has a roll-off switch which is 
recessed. This 
mic can use either phantom or battery power. 
2. As I said   before, the 822 cannot accept phantom power. The 825 which I  
think is the mic you have 
now, can use either. If you're going to be using this mic with phantom power 
you dont need to have the battery in 
it. I think this mic can use 24 volqs of phantom, but you would have to test 
this.
3. If you use phantom power you do not need the battery. The battery is an 
alternative power 
source when phantom power is not available.
4. Phantom power is completely different than plug-in power. Phantom power 
requires from 
12 to 48 volts, where as plug-in power requires from 1.5 to 9 volts. 
To use one of these mics with the new digital recorders such as the edirol or 
the zoom h 1  you need 
to have a battery in the microphone, unless the particular recorder supplies 
phantom power, like the 
zoom h 2. Hope this helps. On Mon, 11 Oct 2010 13:36:32 -0400, Steve Matzura 
wrote:


>I'm hoping someone on either list can answer the following questions
>about two Audio Technica microphones.  Both are single-point stereo,
>both require a single AA battery, both have a five-pin XLR connector
>at their base, with an adapter that turns the five-pin cable into two
>three-pin standard XLR connectors suitable for plugging into mixers.
>One microphone has a three-position switch--off, on, and on with bass
>roll-off, non-adjustable.  My questions are the following:
>
>1.  What are the correct model numbers for these mics?  I seem to
>remember one was an AT822 and the other an AT828, or possibly AT825, I
>just don't recall.
>
>2.  How do these microphones use phantom power when phantom power is
>either 24 or 48 volts and they have a volt-and-a-half battery in them?
>
>3.  If I use phantom power, do I still need the battery?
>
>4.  If I were to use either mic with one of the new handheld digital
>recorders that supply plug-in power, is that of any use, or is plug-in
>power different from phantom power?
>
>Thanks for helping clear up my mystery.  I had the mic with the switch
>and bass roll-off setting, but when it was stolen, I found it could
>not be directly replaced, so I went with the next model in the line
>that has no switch and no selectable roll-off setting.
>
>Thanks in advance.
>
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