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Message: <blockquote data-quote="some dude" data-source="post: 8794519" data-attributes="member: 681010">You can turn the low pass all the way up on the amplifier.Then on your head unit you set the subwoofer channel low pass to 80Hz. On my deck its under the crossover menu. Set crossover at 80Hz and i can select the dB slope (how quick it falls off above 80Hz). 6dB is a slow roll off, 24dB is a quick roll off. Make sense?The high pass a.k.a. subsonic, I'm less familiar with. People say to set it a few Hz below the frequency your box is tuned to.I think it's more important to get this right on a ported box, and that sealed boxes have some safeguards against incorrect subsonic setting.I have a ported box supposedly tuned around 34Hz, so I try to set my high pass around 30Hz.</blockquote>

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