Crossover Slope: The rate at which a crossover circuit attenuates the blocked frequencies. Slope is expressed as decibels per octave. A 6db per octave crossover reduces signal amplitude level by 6db in every octave starting at the crossover point. This means that every time the frequency of the audio signal is changed by a factor of 2 (one octave), the level of the audio signal is attenuated by 6db. For example, if a low-pass crossover is set at 60Hz with a 6db slope, you'll see a drop in level of 6db at 120Hz. With slopes of 12db and higher, the output beyond the crossover point will be reduced to below the level of audibility.

 

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