Re: Danley SM80 and others shootout Monday January 14 at Danley in Gainesville, GA.
Yes I have the I audio interface and the studio 6 test mic.
I have not spent much time with either comparing to my real test gear. But suspect they will work just fine for many applications.
Being loud or not has little to do with it. Unless of course you are just looking at measuring loud signals-at which the internal mic can't handle that sort of level and will give all kinds of skewed results.
The main reason for an external mic is the overall flatness of the response. The internal mic is designed for voice usage. That is not to say you can't get some decent measurements with it. I have not tested my mic against my real gear either. But think it is "moderately accurate".
The whole thing comes down to "what are you here to do?" And how accurate does the tool need to be? Some situations do not require a high degree of accuracy and others do.
If it is a "relative difference" you are looking for-then you could be 20dB off and still be just fine. But if you are looking for an "absolute", then you are going to need to be much more accurate. How accurate? That depends---What are you here to do? Rough in a sound system or gather data for a court case?