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<blockquote data-quote="XanderMoser" data-source="post: 3109373" data-attributes="member: 574859">Crossover frequency is not the same as subsonic filter. Subsonic filter is meant to filter out very low frequencies so that your sub doesn&#039;t play them (subs in vented boxes tend to exceed excursion and/or lose control as the frequency extends below the tuning frequency). The crossover frequency for your subwoofer is actually a low pass, while the subsonic is a high pass. The crossover frequency is in the general range of 60-100 hz. The only way to pick a freq is to play with it and see what sounds best.The lower your speakers can go, the lower you usually have the crossover frequency. If your speakers are not high passed and are bottoming out or distorting from bass, then they need to be high passed.Once the speakers are high passed, you usually base the low pass for the sub on this frequency, it is slightly lower so that the -3 db points match up so there is no gap in the frequency response. But the only thing that matters is if it sounds good to you, so experiment.</blockquote>

[QUOTE="XanderMoser, post: 3109373, member: 574859"] Crossover frequency is not the same as subsonic filter. Subsonic filter is meant to filter out very low frequencies so that your sub doesn't play them (subs in vented boxes tend to exceed excursion and/or lose control as the frequency extends below the tuning frequency). The crossover frequency for your subwoofer is actually a low pass, while the subsonic is a high pass. The crossover frequency is in the general range of 60-100 hz. The only way to pick a freq is to play with it and see what sounds best. The lower your speakers can go, the lower you usually have the crossover frequency. If your speakers are not high passed and are bottoming out or distorting from bass, then they need to be high passed. Once the speakers are high passed, you usually base the low pass for the sub on this frequency, it is slightly lower so that the -3 db points match up so there is no gap in the frequency response. But the only thing that matters is if it sounds good to you, so experiment. [/QUOTE]

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