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"Scientists have simulated the sounds set to be made by sub-atomic particles such as the Higgs boson when they are produced "

In a perfect world, you could enjoy great sound by installing just four full-range speakers - one in each corner of your car. In the real world, things aren't quite that easy. Full-ranges simply aren't up to the task of accurately reproducing the entire music spectrum. That's why top-notch systems employ two or more component speakers - like a woofer and tweeter - per channel. Each component is designed to reproduce a specific range of frequencies, and together they can cover the entire music spectrum accurately.\n\nA complication arises, however, since source components such as CD players deliver all of these frequencies - low, high, and in between - as a single music signal. This is where crossovers come in. A crossover divides the music signal into frequency bands that are compatible with the different types of component speakers.

"It was first suggested in 1995 that the intense pressure waves, which can briefly exceed the speed of sound, could come from trombones."

"Austrian skydiver Felix Baumgartner wants to attempt a record-breaking free fall from 120,000 feet above the Earth. It's not the kind of jump a person can do with a conventional sky-diving suit and helmet. After all, Baumgartner will break the speed of sound during his fall. He will need life-support."

While there are many articles elsewhere that discuss passive crossover design, not all follow a scientific approach. There are several 'off-the-wall' designs scattered throughout the Internet that are a case in point, and unless there is real science described in any article you see, it is best avoided.

Good stuff on what? You title doesn't tell you anything about what the link is for or why it is good.

"Building your own 2 Way/3 Way Passive Crossover Networks"

"A passive crossover has no active filters as were used in the electronic crossover. It uses coils (inductors) and capacitors to cause a rolloff of the audio level."

"Passive Crossovers, Low Pass, Bandpass, Highpass Filters"