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Message: <blockquote data-quote="Mboyle1145" data-source="post: 7964680" data-attributes="member: 646686"><p>lpf is your low pass filter it will filter out frequencies that are played. subsonic will be the low end feqencies that are cut out as well also your head unit might have filters on it for example my alpine has a sub lpf that you can set to 60 80 100 120. also what size box you got and what is the port tuned to</p></blockquote><p></p>

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