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Reload Thread: Ported Rolloff Slope?

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    ShaunMac's Avatar
    ShaunMac is offline Thank You Come Again!



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    Ported Rolloff Slope?

    If I've got 2 ported enclosures tuned to the
    same frequency. One is 2.5cu ft and the other
    is 3.75cu ft.

    Will the larger enclosure yield a steeper rolloff
    below the tuning frequency?

    Also will the larger enclosure produce more SPL at the tuning
    frequency compared to the smaller enclosure?



    Pioneer 8600 - Profile Amp-Infinity Speakers - L7 Subwoofer




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    ShaunMac's Avatar
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    more_spl's Avatar
    more_spl is offline only have 1, but it's 12"



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    what is a rolloff slope, got any link to explain in detail if nobody wants to?
    and whats this " +12dB/octave mean".... i forget




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    ShaunMac's Avatar
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    Rolloff slope refers to a freq response curve where
    the freq response of the speaker falls off and trails
    down below a usable level. This slope can vary in degrees of
    steepness. It's also used to describe x-over points.

    12dB/octave commonly refers to a x-over point and how much
    sound is cut out per octave above(HP) or below(LP) the
    x-over freq.

    For LOW-PASS: If you drop one octave below the x-over point a
    12dB/octave roll-off slope will drop 12dB. Drop another octave and
    your down 24dB from the x-over point.

    The higher the number (36dB/octave) the more sound it
    removes per octave beyond the x-over point. And the more
    accurate it is at eliminating unwanted freq. Steeper Slope



    Pioneer 8600 - Profile Amp-Infinity Speakers - L7 Subwoofer

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