Category: 12v Glossary
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Crossover Slope Crossover Slope

Crossover Slope

 
Added by ANT, 03-28-2012 09:35 PM
High and low pass filters used for speakers do not cut off frequencies like brick walls. The rolloff occurs over a number of octaves. Common filter slopes for speakers are first through fourth order corresponding to 6db/oct to 24db/oct. For example, a first order, 6db/oct high pass filter at 100hz will pass 6db less energy at 50Hz and 12db less energy at 25Hz. Within the common first through fourth filters there is an endless variety of types including Butterworth, Linkwitz-Riley, Bessel, Chebychev, etc. Salesmen and product literature will sometimes make claims of clear superiority for the filter used in the product they are trying to sell. Since the subject fills books, suffice it to say that there is no one best filter, it depends on application and intended outcome. Good designers use the filters required to get the optimum performance from the system.
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