"4015 appears to be more usable, 4011 is not a "main pair" kind of
microphone and will need equalization for this use. A true "far field
linear response" cardioid does not seem to be in DPA's product palette
currently, I don't think they like the compromises it necessitates. "

Bull****. The 4011 makes an excellent main pair mic, especially for chamber
music, no eq needed. I've had great success with them in all kinds of
chamber music, early music being a specialty.