Hear it tossed around quite a lot on this forum and am a bit confused. How exactly an a guitar tone be boxy? Is it full of mids or what? Any examples of what you call boxy? Drums, guitars etc.
boxy / dull / boomy / harsh / muddy / thin etc
http://www.youtube.com/watch?v=Yavx9yxTrsw
edit: something that has a cardboard box kinda quality to it, usually ~400hz overload
at least these are my definitions for those:
boxy = too much low mids (~250-1k region)
dull = or "dark", not enough treble to taste OR too much low end
boomy = too much low end
harsh = too much presence (~1-10khz region), might be distorted and/or too dry
muddy = something that is masking something, usually too much low mids or reverb or colliding elements
thin etc = or "bright", not enough low end to taste OR too much high end