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the Yin and Yang of EQing

It is often talked about the Yin and Yang of EQing (eg. Bob Katz in his book): Boosting a frequency has the same effect as attenuating another frequency in another range.

Is there a relation between Yin and Yang frequencies that could be expressed in musical intervalls like boosting a frequency gives a similar result as attenuating for example one octave above or below?

EQing acoustic guitar for power chords

I'm recording a guy who plays acoustic guitar and sings along. He's using an Ibanez PF5ecent acoustic electric that is plugged straight into my E-MU 1820m. Open chords sound fine and extremely round and perfect. When he plays power chords all I can hear is the god awful fret buzz. How should I tackle this problem, we can rerecord if need be.

EQing the top-end of the frequency spectrum

When checking commercial songs (in 44.1 kHz) with a spectrum analyser, I often see a sharp roll off in frequencies at around 20 kHz or so. Why exactly is this done? In order to make the fact that the frequencies are abrubtly cut off at 22050 Hz inaudible? So is this something I should be reproducing by using a low-pass filter with a sharp Q (I'm using 20504 Hz, Q of 5.79)?