The rate, expressed in dB per octave, at which audio signals are attenuated as frequencies move into the crossover range. A high attenuation rate, e.g. 24 dB/octave means that there is little interaction between adjacent loudspeaker drivers. Low attenuation rates, e.g. 6 dB/octave allow adjacent drivers to operate simultaneously over a wide frequency range. See: Crossover, Octave.
The rate at which a driver attenuates as it starts to see unwanted frequencies. Specified as dB/oct.The higher the number, the steeper the slope, which results in a narrower zone where the sound transitions from one driver to another.