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Message: <blockquote data-quote="IgnoreMe" data-source="post: 3078995" data-attributes="member: 551352">lpf is usually set by ear. your suppose to lower it until it blends nicely with your front stage. problem is, most people have inadequate front stages, so between 60-80hz is generally used. you dont really need test tones for that.and subsonic filters, well i dont really use it cause there is almost no music that plays that low anyways, but if you want to be safe put it around 10hz under what your box is tuned to. a lot of times, ssf arent even needed because no one really makes songs with freq in the mid 20's that might hurt your sub. hell a lot of times you get a big impedance rise when you go far below tuning, meaning your sub wont get enough power to bottom out anyways</blockquote>

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