Narrow BandPass Passive Crossover Calculator
Narrow Bandwidth band pass filters are required whenever the range is less than a decade. The use of the narrow bandwidth band pass formulas are recommended for ranges up to two decades in width. A decade is 10 times the lower frequency of the range of a band pass. For instance, 200 to 2000 Hz is a decade. 200 times 10 is 2000. Two decades would be 200 to 4000 Hz. (200 times 20)