DAD 6017 has pin 2 and 3 directly shorted together. Does 3052 connect those pins through a resistor? A quick search does not bring up a circuit diagram.
I'm pretty sure Sonosax specifies connecting those pins through a resistor when using 2-wire microphones into M2D2. I don't use M2D2 myself, however when taking a look at some SAX instructions posted or linked in another TS thread last week, I recall noting this in regard to how 2 vs 3 wire electrets are accommodated.