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Message: <blockquote data-quote="Kippo" data-source="post: 1423809" data-attributes="member: 10096">appleyard,please read more on filters, freqs. as u got ur facts wrong.freq. does not damage ears, it is the Sound Pressure Level i.e. decibels (dB) i.e. the loudness. Any frequencies that are loud will damage your ears whether it is 20hz or 20khz.Ace,subsonic filter is actually a high-pass filter. It filters freq. below its setting.What is subsonic? it is freq. that is below human hearing which falls in the range of 20hz - 20khz.But what is its main purpose in sub-woofer amp? it is to prevent your sub to over-excurt at the amount of power given to the sub.for example, if ur sub max. excursion is 20mm and at 25hz & 1000W RMS, your sub excursion will be 22mm.If you let this happen, ur sub may get damaged. So you have to set subsonic filter to filter out freq. lower than 25hz i.e. u have to set it to eg. 27hz.Application which needs subsonic filter to be set properly is mainly on ported box where u need to filter the freq. at which ur sub will 'unload'.Also in high power sealed box (in slightly larger box) application because generally sub + sealed box will have two high excursion peaks i.e. in the middle freq. and at the lower end freq.So for those who believe sealed box is safe, think again.Low pass filter is used to set which freq. u want your sub to play.sub-Bass freq. ranges around 150hz ~ 20hz (in fact even lower but that is not in music audio scope).So on the upper range bass freq., you will feel the bass is pouding or hard as what u call it.On the lower range bass freq., you will feel the bass as rumbling or softer as u call it.So where to set Low pass filter?It depends on the bass music u like. If u like hard pounding bass then set your low pass filter higher. If you do not like hard pounding then set it lower.It is all about ur music taste. Dont bother with the numbers. Set it according to what is pleasing to your ears.once you done all the settings, do google and read about 'bass upfront illusion'.</blockquote>

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