Mirza, from what I've read all the DPA headset mics are omni-directional, which tend to have feedback problems. The only super cardiod mics they advertised were handhelds. If you have some specific information, or model number of a non-omni-directional mic made by DPA, please post the link(s).

All the best,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)