As usual, you wish to bandy semantics.You are trying to correct something that did not need correcting.
Please re-read my post:
Both you and kushy are technically correct that the varying freq's in music will not allow one to pinpoint a single, accurate impedance to be able to say, "I have a xx.xx box rise."
However, if one follows the very basic guideline I posted, and play one's favorite "style" of music, then one can at least get a general idea of what to expect in terms of box rise, which allows one to account for something rather than nothing.
Your statements are kind of like someone saying they would rather know zilch if they can't know it all; its gotta be black or white, fukk all that gray; etc, etc.
So, again, I say to you, P!ss off