most advanced speaker in a rectangular wooden box?

Zu Definition 4. . . . or any other speaker with a built-in, powered subwoofer.

Totem Element series. They have unique drivers that are made in house.
 

No one mentioned DeVore. Top rated by all.

Perhaps perceived as too old fashioned for some, I've been pleasantly surprised at how astonishingly good my recently acquired Klpisch Heresy IIIs sound with a pair of subs. Updated here and there, but they get the "Been Around a While" award for model longevity. They require  well sorted amps and cables to get to a "high end" level, but man…a great speaker.

Raidho