Most filters typically have a *cutoff* or *corner frequency* they are tuned to. It then reduces (filters) the frequency spectrum of a signal going through it so that it harmonics get progressively quieter the further away they are from this cutoff. The strength of this effect is referred to as its *slope*. Most filters have slopes that are defined multiples of 6 decibels (dB) weaker for each octave further away you get from the cutoff frequency. For example, a low-pass filter (LPF) with a slope of 24 dB/octave would attenuate harmonics one octave above its cutoff frequency by 24 decibels.