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<blockquote data-quote="squeak9798" data-source="post: 649194" data-attributes="member: 555320"><p>ANeonRider hit the nail on the head. Keep in mind that a crossover (highpass, lowpass, subsonic, etc) ISN&#039;T a brick wall. It doesn&#039;t just kill the frequencies above the crossover point. It attenuates (which means to reduce the amplitude of)&nbsp; the frequencies above or below the crossover point at a predetermined slope (or rate). For example, a lowpass set to 50hz with a slope of 12db/oct (12 decibels per octave) attenuates frequencies above the crossover point at a rate of 12 decibels per octave. Everything below the crossover point (in the case of lowpasses) pass through unfiltered. So, you still hear some of the frequencies above 50hz because they haven&#039;t been attenuated to an inaudible level. The farther away from 50hz the frequency is, the quiter it will be.&nbsp; The same applies to highpasses (only, in HPF the frequencies below the xover point are attenuated) and subsonic filters.</p></blockquote><p></p>

[QUOTE="squeak9798, post: 649194, member: 555320"] ANeonRider hit the nail on the head. Keep in mind that a crossover (highpass, lowpass, subsonic, etc) ISN'T a brick wall. It doesn't just kill the frequencies above the crossover point. It attenuates (which means to reduce the amplitude of) the frequencies above or below the crossover point at a predetermined slope (or rate). For example, a lowpass set to 50hz with a slope of 12db/oct (12 decibels per octave) attenuates frequencies above the crossover point at a rate of 12 decibels per octave. Everything below the crossover point (in the case of lowpasses) pass through unfiltered. So, you still hear some of the frequencies above 50hz because they haven't been attenuated to an inaudible level. The farther away from 50hz the frequency is, the quiter it will be. The same applies to highpasses (only, in HPF the frequencies below the xover point are attenuated) and subsonic filters. [/QUOTE]

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