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<blockquote data-quote="Alpineforever" data-source="post: 4500797" data-attributes="member: 585728">If your running a sub you&#039;ll want to set the switch to LP, which means &quot;Low Pass Crossover.&quot; This filters out all of the frequencies above the set point, allowing only frequencies lower than the set point to get to the sub.A good starting spot for the LP crossover is ~80Hz and then experiment from there. You set this frequency with the frequency knob you mentioned.HP means &quot;High Pass Crossover.&quot; It is the opposite of a Low Pass crossover, it filters out everything lower than the set frequency and only transmits frequencies higher than the set point.Don&#039;t know what AP means in this context.If your amplifier has a sub sonic filter it can also be used to further the tuning. Whatever you set your sub sonic filter to works kind of like a Hig Pass crossover, except that it works in concert with your LP crossover. It filters out all frequencies below the set point to prevent your sub from seeing frequencies too low for it to hit. So if you were to set it to 25 Hz, it would allow frequencies above 25Hz to pass, while filtering out the lower frequencies.Thats a basic explanation of what all of those settings do, it&#039;s a lot more complicated than i explained, and it&#039;s not quite as cut and dry of a filter as i explained, but that would take forever to explain and you can probably find it by searching.</blockquote>

[QUOTE="Alpineforever, post: 4500797, member: 585728"] If your running a sub you'll want to set the switch to LP, which means "Low Pass Crossover." This filters out all of the frequencies above the set point, allowing only frequencies lower than the set point to get to the sub. A good starting spot for the LP crossover is ~80Hz and then experiment from there. You set this frequency with the frequency knob you mentioned. HP means "High Pass Crossover." It is the opposite of a Low Pass crossover, it filters out everything lower than the set frequency and only transmits frequencies higher than the set point. Don't know what AP means in this context. If your amplifier has a sub sonic filter it can also be used to further the tuning. Whatever you set your sub sonic filter to works kind of like a Hig Pass crossover, except that it works in concert with your LP crossover. It filters out all frequencies below the set point to prevent your sub from seeing frequencies too low for it to hit. So if you were to set it to 25 Hz, it would allow frequencies above 25Hz to pass, while filtering out the lower frequencies. Thats a basic explanation of what all of those settings do, it's a lot more complicated than i explained, and it's not quite as cut and dry of a filter as i explained, but that would take forever to explain and you can probably find it by searching. [/QUOTE]

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