Electrical Engineering › Section N · Decibels, filters, and Bode plots › Topic N.5
Limited-attenuation filters and crossover networks
Not every filter should cut a signal away completely. Adding one resistor makes an R-C filter level off at a fixed attenuation, a shape used for tone controls and equalisers, and simple first-order filters also steer bass and treble to the right loudspeakers.
In this topic
- Filters that level off
- A low-pass filter with limited attenuation
- Reading its Bode plot
- Worked example: a limited low-pass filter
- A high-pass filter with limited attenuation
- Worked example: a limited high-pass filter
- The standard factors at a glance
- Crossover networks
- Worked example: a two-way crossover
- Three-way systems and real loudspeakers
- Common mistakes to avoid
- Key takeaways
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