It depends on what frequency you want.
This is for your subs, right?
Are you using the LPF on the amp? If you are then you don't really need it on at all.
If you're not then you set it to the desired frequency. Most likely 78Hz (not hzs!).
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Cliff Scott
2004 Alero GX w/sport pkg - Sold, living somewhere in WI now.
2011 Saab 9-5 Turbo4 M6
2004 Corvette Convertible M6
1994 Chevy Beretta - Quad4/M5
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