John, I agree with you in spirit but not in whole. Most mics are flat enough, or have a gentle slope, such that if you go through a room mode, you still will see it 'loud and clear', when you do either a sweep or a broadband noise excitation as I suggested above.

I agree with you in spirit because for 20+ years I have used measurement grade microphones from Brüel & Kjær and G.R.A.S. on the job, when I needed precision.

In this case precision is really not necessary. Even an SM 57 http://www.shure.com/idc/groups/public/documents/webcontent/us_pro_sm57_specsheet.pdf has a flat enough response in the low end such that you can do these kinds of measurements. If there was a big resonance bump in the low end response, then that can throw one off. With an SM 57, with it's gradual rise in the low end as frequency increases, what one should expect to see in the recorded time history is just a gradual rise in the recorded level over the sweep.

However, my suspicion is that Knightsounds' room is like most of our home studios, in a bedroom or basement or office, where room modes can dominate low frequency response.

If the monitors are in a corner or close to a wall (say within 1.5', then he/she is going to couple with those room modes and they will totally mess with low frequency mix ability.

The recorded sweep will have pretty sharp bumps where the room modes are an issue.

-Scott

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