Joseph Crowe's DIY Speaker Building Blog: Xkitz 2-Way Active Crossover
How To Design A Crossover For A DIY Speaker || Part 1 - Crossover Design Intro - YouTube
Amazon.com: High Power 2 Way Audio Speaker Crossover, DIY Circuit Board Design for Treble and Bass, Clear Sound with Enhanced Bass, Dual Frequency Dividing, Perfect for Speakers and Car Audio : Electronics
Making The Crossovers For My Speakers PLUS Sound Test - YouTube