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Originally posted by tbrugh:
Uh, you left out the part where I mentioned crest factor, nbarts. I'm open to learn something new if you want to share with me an easier and quick way to determine loudness outside of RMS/crest.

I believe you when you say you've had -12dB RMS levels that sound louder than -9dB RMS levels. I'm also quite sure there's a reasonable explanation for that particular case as well.

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Obviously there are other components, like spectral balance. The human ear is much more sensitive to mids than lows, for example. So, not all energies are equal with respect to perceived loudness.