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  1. #1
    tsenfw's Avatar
    tsenfw is offline CarAudio.com Elite



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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
    Trixter is offline Keepin it Simple



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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 15" Brahma running off Cadence A7hc, Clarion hu, MB Quart 6.5s and 5.25s running off old school Punch 800a4

    146+db @ 38hz with 1200w and a single 15"

    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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