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Crossovers block out frequencies so they don't damage speakers that aren't designed to play said frequencies... for example, a tweeter (small 1" speakers) are designed to play high frequencies, like the sound of cymbals (sp?), so it doesn't receive any midrange (vocals) to lower frequencies (bass) with the aid of crossovers...
Similarly, woofers shouldn't get any vocals or high frequencies, so you can filter out those frequencies from a sound input using a crossover.
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