Passive crossovers, really any crossover, is a circuit that will split a full-band audio signal into a number of smaller ones.
For example, your tweets can't handle low frequencies so feeding them low freqs is quite useless as the speak will actually still try to reproduce them. Same with the woofers, though it feeds them everything below a certain freq, more or less. There's slopes and such involved here as well, but you get the general idea.
Near perfect sound can be acheived with good speaks and a good crossover network. EQ's need not apply.
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Get off your fuckin cross. We need the fuckin space to nail the next fool martyr.
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