ECM999 : If you are looking to save on Sonarworks' mic cheaper substitution this might be it.

I have bought this with an intention to use with Sonarworks Reference software. Sonarworks asked me for the calibration profile and I couldn't find any for this mic so I skipped the step and was doubting it's accuracy. I've performed my measurements, put it on shelf and forgot about it. Later I had a chance to test a genuine Sonarworks mic with most accuracy and I performed the same test with ECM999 just after that. After comparing the results I can say this one's definitely worth it's money: I don't remember clearly but I won't lie if I say that in my room the differences would be no more than +-1.5 dB across mids and higs while lower frequencies would be almost identical. I have also recorded some percussions with these and got a fairly acceptable result even though I think it's not designed for this kind of needs.