Note: For those just tuning in, I do realize that this is not biamping in the purest sense (using the speaker's passive crossover), so I don't want to look as though I'm giving uninformed advice here. However, this type of connection has become popular enough now that many people generally regard it as such, just as the author of the article has done.
I would also comment that the article does seem to exagerrate the benefits (both of bi-wiring and "bi-amping"), which I failed to mention in the previous post.
Biamping in the purest sense is a complicated matter that involves active crossovers, multiple identical amplifiers, and tweaking headaches beyond measure. Not reallly something a beginner should worry over at this point in the game.