A unique guide to the design of high-quality circuitry for audio gear

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Title: The Design of Active Crossovers
Category: Electronic Music, Professional Digital Music, audio equipment, electronics
Author: Douglas Self
ISBN-13 number: 9780240817385

Binding: Paperback
No. of Pages: 608
Publisher: Focal Press
Publication date: 27/05/11
Dimensions: 7.5"x9.25" (19x23.5cm)

The Design of Active Crossovers is a unique guide to the design of high-quality circuitry for splitting audio frequencies into separate bands and directing them to different loudspeaker drive units specifically designed for handling their own range of frequencies. Traditionally this has been done by using passive crossover units built into the loudspeaker boxes; this is the simplest solution, but it is also a bundle of compromises. The high cost of passive crossover components, and the power losses in them, means that passive crossovers have to use relatively few parts. This limits how well the crossover can do its basic job.

This book is packed full of valuable information, with virtually every page revealing nuggets of specialized knowledge never before published. Essential points of theory bearing on practical performance are lucidly and thoroughly explained, with the mathematics kept to an essential minimum. Douglas' background in design for manufacture ensures he keeps a wary eye on the cost of things.


  • Crossover basics and requirements
  • The many different crossover types and how they work
  • Design almost any kind of active filter with minimal mathematics
  • Make crossover filters with very low noise and distortion
  • Make high-performance time-delay filters that give a constant delay over a wide range of frequency
  • Make a wide variety of audio equaliser stages: shelving, peaking and notch characteristics
  • All about active crossover system design for optimal noise and dynamic range

Chapter 1: Crossover Basics
Chapter 2: How Loudspeakers Work
Chapter 3: Crossover Requirements
Chapter 4: Crossover Types
Chapter 5: Notch Crossovers
Chapter 6: Subtractive Crossovers
Chapter 7: Lowpass & Highpass Filter Characteristics
Chapter 8: Designing Lowpass & Highpass Filters
Chapter 9: Bandpass & Notch Filters
Chapter 10: Time Domain Filters
Chapter 11: Equalisation
Chapter 12: Passive Components for Active Crossovers
Chapter 13: Opamps for Active Crossovers
Chapter 14: Active Crossover System Design
Chapter 15: Subwoofer Crossover
Chapter 16: Line Inputs and Outputs
Chapter 17: Line Outputs
Chapter 18: Power Supply Design
Chapter 19: An Active Crossover Design
Appendix 1: Crossover Design Reference Appendix 2: Loudspeaker Design Reference

The Design of Active Crossovers
Focal Press
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