1. Understand The Basics Of Speaker A typical 3-way speaker looks something like this: The crossover decides which frequencies go to each driver.For example:DriverApproximate jobWooferBassMidrangeVocals / instrumentsTweeterHigh frequencies The crossover is made from three major component types:1. Capacitor – Usually controls/high-passes frequencies2. Inductor – Usually used for low-pass filtering3. Resistor – Controls electrical level and damping 2. Don't Upgrade Everything At Once You may upgrade accordingly 1. Understand the original crossover. 2. Replace a component at a time3. Test and Listen the differences4. Decide whether to keep the modification.