I'd like to point something out here, the loudness button is not for "Wow factor" it's a remedy to an old audio problem in that deep bass and high treble are difficult to reproduce at lower listening levels. Plotted with a pink noise generator and a spectrum analyzer (Both of which I used to own and someday will again) you'll see that as volume levels drop the upper and lower ends of the spectrum will roll off faster than the rest of it. Hence the loudness compensation was born. The purpose is to raise the ouput of the amp at these points in the spectrum (Actually raising the voltage the amp emits at those frequencies) thereby making the sound more natural. A properly designed loudness circuit will roll the equalization off as the volume is increased until there is none. That is all.
Phenom II 940 Black Edition quad core @ 3.5Ghz
2x1 gig OCZ PC26400 Platinum, 2x1gig GSkill PC26400
Some other stuff,
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If the automobile had followed the same development cycle as the computer, a Rolls-Royce would today cost $100, get a million miles per gallon, and explode once a year, killing everyone inside. --Robert X. Cringely, InfoWorld magazine