The Design of Active Crossovers, 2nd Edition

Chapter 4

Crossover Types

There are many types of crossover, classified in various ways. The categories listed here define what the crossover does, not how it does it. It is essentially a catalogue of target functions. It does not matter how the filter responses are obtained; that may be by filtering alone or a combination of filtering and drive unit responses.

All-Pole and Non-All-Pole Crossovers

In discussions of crossover design, and in filter design generally, the terms “pole” and “zero” tend to be freely scattered through the text. These terms relate to the complex mathematical equation that describes the response of a filter or other frequency-dependent system such as a servomechanism. A complex equation is one involving j, the square root ...