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Reload Thread: port size for 12" sub

  1. #1
    cooldoctorb's Avatar
    cooldoctorb is offline Member



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    port size for 12" sub

    Does anybody know how long my 4" port needs to be.

    Here are my specs

    Box Size 1.92 Cubic Feet
    Fs 27Hz
    Vas 58L
    Qts 0.38

    Any suggestions would be great. Thanks







  2. #2
    ShaunMac's Avatar
    ShaunMac is offline Thank You Come Again!



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    The length of the port depends on what freq you want the box tuned at.

    For more SQ try tuning lower.
    28Hz would require the port to be about 20" long.

    For more SPL try tuning higher
    33Hz would require the port to be about 13.5" long

    You could tune even higher for increased SPL. But you would really start to lose SQ. Your low end response would start to disappear with a high tuned box.

    It all really just depends on what kind of sound your looking for.



    Pioneer 8600 - Profile Amp-Infinity Speakers - L7 Subwoofer

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