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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 7764196" data-attributes="member: 576029">amp gain low or high is set for the expected signal level out of the amp. it's relative.  the manual will tell you what it is.since you are powering your speakers from the HU - you find the loudest point you want to listen to speakers on the HU then adjust sub gain to match.set bass level to whatever level you listen to.  if you like some bass boost, set it before you set gains.  otherwise, using bass boost after can cause clipping.  i know some tutorials say not to do this.  they are wrong.  if you have bass at -6 to protect the speakers, that is fine to do and i understand why.HU LPF is fine to use - it increases the slope of the LPF which is good.  i prefer 24dB/oct LPF slope, most amps and HU's are only 12dB.  it is fine to cascade filters.</blockquote>

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