"Or if you are recording backing tracks for use on gigs, you could model your PA speakers actual frequency response, then model various sized rooms."



I have found that I get much better results by actually doing final mix EQ tweaks through the mixer/amp/PA speakers. With my large rig, that usually requires pulling out some low-mids.


The frequency response difference between phones, near fields and PA enclosures is huge, and when you factor in the coloring of the board and amp, it's virtually impossible to simulate that combination.


While it's true that a well-mixed song should sound good on most systems, PA's are another matter.