Glossary term
Filter Slope
Filter slope describes how rapidly a filter attenuates frequencies outside its passband, usually in decibels per octave.
An octave doubles or halves frequency. For conventional all-pole filters, each order adds about 6 dB per octave to the eventual roll-off; the transition near crossover also depends on alignment.
Filter Slope — Crossover
For an active crossover, slope determines how strongly a branch rejects frequencies beyond its intended band. High-pass and low-pass branches can offer separate slopes.
Compare the stated electrical slope and selected settings. The driver’s own response contributes to the resulting acoustic slope, so a 24 dB-per-octave electrical filter does not automatically produce that exact acoustic roll-off.