Craig T:
You're right, I was confusing the PS-2 with the AD-20. Anything beyond a simple battery box is new to me so this is all a little confusing yet.
Schwillaby:
I didn't have to make any modifications. The DPA's have a 1/8" plug that goes into the SP battery box. I've only used to tape two bands so far, but it sounds nice. I guess I don't know for sure if they bass roll-off aspect is working, but as a battery box it is working. I would assume the bass roll-off part is working though. Also, no one recommended this setup. I just bought the DPA's used and wanted to run a battery box/bass roll-off but didn't want to pay to have the cable modified into a mini-xlr to fit the core sound battery box so I experimented with a friends sound prof. battery box and it works just fine.
Chris