Douglas Self

The Design of Active Crossovers

• Gebundenes Buch

Produktbeschreibung

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. Active crossovers, sometimes called electronic crossovers, tackle the problem in a much more sophisticated manner. The division of the audio into bands is performed at low signal levels, before the power amplifiers, where it can be done with much greater precision. Very sophisticated filtering and response-shaping networks can be built at comparatively low cost. Time-delay networks that compensate for phyical misalignments in speaker construction can be implemented easily; the equivalent in a passive crossover is impractical because of the large cost and the heavy signal losses. Active crossover technology is also directly applicable to other band-splitting signal-processing devices such as multi-band compressors. The use of active crossovers is increasing. They are used by almost every sound reinforcement system, by almost every recording studio monitoring set-up, and to a small but growing extent in domestic hifi. There is a growing acceptance in the hifi industry that multi-amplification using active crossovers is the obvious next step (and possibly the last big one) to getting the best possible sound. There is also a large usage of active crossovers in car audio, with the emphasis on routing the bass to enormous low-frequency loudspeakers. One of the very few drawbacks to using

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Produktdetails

• Verlag: Taylor & Francis Ltd (Sales)
• Erscheinungstermin: 30. Juni 2017
• Englisch
• Gewicht: 1120g
• ISBN-13: 9781138406476
• ISBN-10: 1138406473
• Artikelnr.: 48949720

Inhaltsangabe

Acknowledgments
Preface
1. Crossover Basics
2. How Loudspeakers Work
3. Crossover Requirements
4. Crossover Types
5. Notch Crossovers
6. Subtractive Crossovers
7. Lowpass and Highpass Filter Characteristics
8. Designing Lowpass Filters: Sallen & Key
9. Designing Highpass Filters
10. Other Lowpass and Highpass Filters
11. Lowpass and Highpass Filter Performance
12. Bandpass and Notch Filters
13. Time-Delay Filters
14. Equalisation
15. Passive Components for Active Crossovers
16. Opamps for Active Crossovers
17. Active Crossover System Design
18. Subwoofer Crossovers
19. Motional Feedback Loudspeakers
20. Line Inputs
21. Line Outputs
22. Power Supply Design
23. An Active Crossover Design
Appendix 1: Crossover Design References
Appendix 2: US Crossover Patents
Appendix 3: Crossover and Loudspeaker Articles in Wireless World/
Electronics World
Appendix 4: Loudspeaker design references
Appendix 5: Component Series E3 to 396
Index