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Reload Thread: Ported enclosure and subsonic filter

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    Ported enclosure and subsonic filter

    I'm told to go with a ported enclosure, you'll benefit from a subsonic filter.

    This is probably a dumb question, but ebay turns up this, a passive adjustable subsonic filter. However, all the frequencies are a multiple of five. Would I have to port the box to the same frequency, or would a Xhz enclosure and X-4hz subsonic filter work fine?

    EDIT: Just to make myself sound more like an idiot: this thread answered this, but I have no idea what a 1/2 octave would be.







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    Re: Ported enclosure and subsonic filter

    one octave below is half of the frequency
    so 1/2 octave is half way between that frequency and the frequency of one octave below



    MdOiDcEtRaAtToOrR
    1996 Chevrolet Impala SS 14.5 @ 94
    1967 Chevrolet Camaro 18.4 @ 74

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    Re: Ported enclosure and subsonic filter

    Here we go.

    On full octave down from 100 hz would be 50 hz, right? One full octave up would be 200. One octave up = double the frequency, one octave down = half the frequency.

    Therefore, since I want to port it near 30, I would have to filter out 15 and below. That peticular crossover will handle down to 20. It should be alright.




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    Re: Ported enclosure and subsonic filter

    yes, one octave below 30Hz is 15 Hz, but 1/2 an octave below 30Hz is 22.5 Hz since 22.5 is half way between 15 and 30



    MdOiDcEtRaAtToOrR
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