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    tsenfw's Avatar
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    Port size help

    Ok, I have a 8" JL 8w3v2 that I'm bumpin till my 12 comes in the mail (also for testing purposes). I have it mounted in .77cu ft enclosure after sub displacement and it's obviously wayyyyyyy over the recommended .375 sealed enclosure size. The recommended ported size is .75cu ft.

    If I wanted to add port(s) to this enclosure to tune it to 30hz what diameter and length pvc could I use? I couldn't find the correct answer with winisd, I was getting some really screwy results like 145" length!

    I know it's ghetto, I just want some bass in the mean time and see what this 8 can do!

    Sub specs:
    # Size : 8"
    # Free Air Resonance (Fs) : 34.5Hz
    # Electrical "Q" (Qes) : 0.468
    # Mechanical "Q" (Qms) : 7.84
    # Total Speaker "Q" (Qts) : 0.441
    # Equivalent Compliance (Vas) : 0.79 cu. ft. / 22.4 liters
    # One-Way, Linear Excursion (Xmax) : 0.39" / 9.9mm
    # Reference Efficiency (no) : 0.189%
    # Efficiency (1W/1m) : 85.0dB SPL
    # Effective Piston Area (Sd) : 33.2 sq.in. / 0.0214 sq.m.
    # DC Resistance (Re) : 6.70-Ohms
    # Nominal Impedance (Znom) : DUAL 4-Ohms
    # Power Handling (Continious) : 125 Watts
    # Mounting Depth : 4.31" (109mm)
    # Approximate Weight : 8.3 LBS







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    Re: Port size help

    bump




  3. #3
    Trixter's Avatar
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    Re: Port size help

    a 2" round port thats 11" long will do it for you....

    ideally you would want more port area than that, but since you have such a small box, the port would end up being so long......even a 3" port would end up being almost 30" long.



    2006 Jeep Liberty
    Adire Audio, Cadence, Clarion, MB Quart

    Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
    *Vb = vol. in cu"
    **R = sq.rt. A / Pi (for square/slot port)

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