this would be the first directional cap in that series to use pressure gradient instead of interference tube for directionality
I'm pretty certain all the DPA directional caps which incorporate interference tubes
are pressure gradient microphones, which additionally incorporate short interference tubes to improve pattern control at high frequencies. That's partly because I'm unaware of any another fundamental arrangement able to maintain directional pattern in the the low-frequency through mid-frequency range. The length of these short interference tubes makes them ineffective at pattern control below 5kHz or so, perhaps even higher.
My 4098H mics have a small rear vent on the rear of the mic body in addition to having the short interference tube grids. Although it does not appear that the 2011 has a traditional rear vent opening, I suspect the actual diaphragm location may be somewhat forward of the where the venting down the side of the microphone terminates. In other words, I suspect there is an internal rear vent behind the diaphragm location and this is not visible from the outside of the microphone. I've not had one in hand to examine though, and although I've searched photos of 2011 to try and find one with enough backlighting through the side vents to show the works inside, I've been unable find one. Nor have I been able to find online any good technical description of the design.
i was told that they are working on full series of 2000, 4000, and 6000 series to suit all markets. the 2000 series of the 4060s will be most interesting, as will the 6000 series versions of the 4011s, etc
This should be interesting.