"His standard for low voltage mics is inverting, which corrects the typically inverted polarity output of most small electret microphones. The DPA miniature microphones produce a non-inverted output signal, so if you go the PFA route, ask for them to be non-inverting. The DAD6001 is non-inverting as it was designed to work with DPA mics. The signal polarity issue is probably only an issue if you are mixing multi-channel sources. You can always invert polarity of the track in your editor of course, but this avoids the need to do that, and allows for internal mixing in multichannel recorders which do not provide signal polarity switching."
I've never heard of electrets being polarity inverted? Where does that info come from?
Thanks