Looking at the sats I can tell that each has one active driver (located in the center) and 2 passive radiators also known as a butterworth 4th order tuned port which use the air inside the speaker enclosure to couple the radiators to the driver via fluid dynamics.
The middle driver is an inverted dome full range driver, basically a hopped up tweeter that has a suspension allowing for greater movement so that frequencies down to the crossover point are covered and the passive radiators help to reinforce the upper bass registers.
I'd also imagine that the crossover point for the sats is somewhere in the area of 200-180hz rolling off at 6db per octave and the sub is likely crossed over at around 120hz but that's just an educated guess.
Nice little setup.
Phenom II 940 Black Edition quad core @ 3.5Ghz
4x2 Gigs Patriot PC2 6400
Cooler Master HAF XB EVO,
Some other stuff,
Even more stuff,
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