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Message: <blockquote data-quote="dreamer" data-source="post: 28453" data-attributes="member: 542613">For a Low pass filter you will need to put an Inductor on the line. The capacitor is a high pass cross over. I think you can get a passive cross over that will plug into your RCA plugs around the amp from a car audio install shop. It's a good idea to have a low pass crossover because the high frequencies in the sub just adds more current to your sub and can cause it to burn out.I have had subs running on full range output, never heard the "clicking" problem that you've described. Like everyone is saying, make sure that everything on that box is air tight and secure. If you got a ported box, you may need a subsonic filter as well.</blockquote>

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