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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.

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.

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COSMOS is a literary science magazine with a global following. Australia's #1 science media brand, it reaches 400,000 people every month via a print magazine, a daily online news website and a weekly e-newsletter. Our COSMOS Teacher's Notes reach 65% of Australian high schools, and we produce a wide range of quality editorial products (such as websites, booklets, posters and DVDs) for a range of clients. COSMOS internationally respected for its literary writing, excellence in design and engaging breadth of content. It's the winner of 44 awards, including the Magazine of the Year trophy in both 2009 and 2006, and twice Editor of the Year, at the annual Publishers Australia Excellence Awards. COSMOS has also won the American Institute of Physics Science Writing Award, the Reuters/IUCN Award for Excellence in Environmental Journalism, the City of Sydney Lord Mayor's Sustainability Award and an Earth Journalism Award.

"The engineer at Embry-Riddle Aeronautical University in the US is currently finalising designs for a series of turbines that could be used to harness the immense energy of the Gulf Stream, flowing deep in the Atlantic Ocean."

"A space suit and pressure helmet designed to protect Austrian skydiver Felix Baumgartner in his record-breaking 120,000ft (36,576m) free-fall attempt have been revealed to the public."

"The Symphony of Science is a musical project headed by John Boswell designed to deliver scientific knowledge and philosophy in musical form. Here you can watch music videos, download songs, read lyrics and find links relating to the messages conveyed by the music."

"Their heads move some 6m per second, at each peck enduring a deceleration more than 1,000 times the force of gravity. But researchers reporting in Plos One say that unequal upper and lower beak lengths and spongy, plate-like bone structure protect the birds' brains. The findings could help design more effective head protection for humans."

Earthship Biotecture creates buildings that... * Heat and cool themselves naturally via solar/thermal dynamics * Collect their own power from the sun and wind * Harvest their own water from rain and snow melt * Contain and treat their own sewage on site * Produce food in significant quantities * Utilize materials that are byproducts of modern society like cans, bottles and tires

On the physics and mechanics of a medieval trebuchet, a type of catapult, its design, working and optimization through improved simulation and mathematical analysis.

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