🚀 go-pugleaf

I think that you should probably read the AudioMasters sticky thread <http://www.audiomastersforum.org/amforum/viewtopic.php?t=1601> about this, which also has a link to the String Line Mix primer full version (there's an edited version of this on this forum's FAQ as well). This has the advantage of having pictures...

The Ozone mastering guide also has information about this - look at the stuff about the EQ reference slopes. The basic answer to this (not the foolish version!) is that there are two, depending on what sort of sound you are shooting for, and they slope down at either -3dB/octave or -6dB/octave from somwhere around 1kHz. Obviously, the -3dB slope gives you a brighter overall sound than the -6dB one does. The spectrums are not an absolute God-given thing, and we are talking average here, not all of the time - but they have generally been found to give results that most people find acceptable. The -6dB curve actually keeps the same amount of spectral energy throughout the audio range if you stick to it - which is probably why it's generally acceptable.