JohnK is correct about the C-Weighting curve not being flat... But I disagree about adjusting it to C-Weighting flat.
That should not be done if you want an accurate system because you would end up with non-flat frequency response where your deep bass overpowers the rest of the music.
Well produced music is designed to be heard on a neutral system, not a system that compensates for the inadequacies of the human ear.
Use this to compensate for the meter in the bass region. I do this when I calibrate my system and it has never failed me. By the way, if you want a good program to generate test sweeps in, out of, and independent in phase, look
here.
In the end, audio is such a subjective field. Do what sounds best to you! I know that I used to be a bass-head before and a flat frequency response used to sound "FLAT" to me. Now if I listen to boomy bass, I almost feel disgusted by it.
