For optimum tuning of a loudspeaker system requires a suitable crossover. This links to design schematics including its assets and liabilities

Here you will find Schematic Circuit Diagram for DIY and further information on Crossovers
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Active three-way crossover	sound.westhost.com/project78.htm
Basics of crossovers and a passive 2-way design	sound.westhost.com/lr-passive.htm