I do have a pair of DPA 2011c. Don't quote me on this, but I believe they use the same capsules as the 406X lavaliere microphones. Their response is not quite as flat, and they are not as quiet as the 4011's. I was planning on using them as a small stereo pair for location work, but have not done so as of yet. I did use them as a voice over mic, and the client was happy with the sound.