Is cascaded crossover technology a fancy phrase for series crossover?
No. If I weren't "Restricted" I could post a schematic for a 3-way cascaded crossover. Since I can't I'll do my best to describe it.
Instead of all of the elements being star wired, here is the scheme: the midrange circuit input is wired into the circuit after the low-pass elements. Obviously, computed bandpass components won't work, so the values have to be adjusted to achieve proper summation. Likewise, the tweeter circuit input is wired to the output of the midrange. Again, juggle the values to get acceptable overall frequency response.
The obvious advantage is additive attenuation to the midrange driver and tweeter resulting in either: tremendous power handling or much lower possible crossover points and very low distortion.
It is, however, not for the faint of heart because the necessary values are very different from a star wired parallel crossover. I hope this makes sense.