I got excited back in 2008-ish when the 5100 was announced because it was somewhat similar to my arrangement.
A couple threads from back then:
dpa 5.1Re: DPA 5100 into a hat?In the first thread I was trying to figure out what's going on inside and
even drew a speculative drawing based on the published polar-patterns for each of the 5 primary channels of the 5100. I've never actually seen one in person, much less looked inside. As I recall, this was prior to DPA offering miniature cardioids and supercards. The 5100 was likely the first DPA product to use them, in the coincident center position if not in all five positions. If so it probably uses a miniature omni for the .1 output channel. Output is 5.1.
My arrangement is different in not using any directional mics, instead boundary mounting the omnis on separate faces of the baffle, and that makes the omnis quite directional from the mid-range up. The mics face forward, back, and left/right. The baffle is considerably wider in the L/R dimension so the front and backward facing omnis end up being more directional than the L/R pair that are mounted on much narrower curved baffle faces, but are spaced farther apart to compensate. Output is L/C/R/S.
Edit- if DPA (or anyone) made a miniature figure-8, I'd really love to turn each of those omnis into a on-baffle-boundary-mounted M/S pair, which would require 8 channels total, but would be great fun to play around with, would provide a lot of additional flexibility and potentially make it even better. But I love this arrangement as is for any seated performance from the right location, especially classical.