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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)?

"Mud" Frequency Area

Hi,

I was wondering how you guys eq the "mud" area from 200 Hz to about 500 Hz ? Like give the basskick a cut around 400 Hz, and boost the bassguitar there, or cut bassguitar around 100 Hz and boost the basskick there for example.
So which space do you give your instruments in that "trouble" area ?

Thank you in advance.

Frequency Panning?

How do the pros get that perfect master with what seems like an emphasis on deep bass + highs on the left and mid bass + mids on the right? And I know this is a mastering forum but does anyone have any advanced panning techniques especially regarding different frequencies and effects

Thanks,
Ryan Chamberlain