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Message: <blockquote data-quote="maylar" data-source="post: 347413" data-attributes="member: 541144">Filters are for limiting the range of frequencies that go to your speakers or subs so they work in the range they were designed for.Hi Pass means everything above a certain frequency goes through, everything below gets cut out. We use that to keep bass out of our main speakers.Low Pass is the opposite - you use that to keep highs out of the subs. As already mentioned, 80 Hz or so is a good number for that.Some amps come with both hi and lo filters so you can use them with either main speakers or subs. There will be a switch on them to allow you to select which filter to use. For subs you'll want the lowpass.</blockquote>

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