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  1. #1
    aznbo187's Avatar
    aznbo187 is offline Junior Member

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    Feb 2009
    West Hills, CA
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    Advice for dual 8" ported build

    Hey guys, I'm new here and have been trying to do a bit of research on getting a ported box made. Depending on how confident I feel, I may attempt to do it myself, or have someone else do it for me.

    I'm doing a stereo build for my 1991 BMW 325i coupe. The car currently has rear deck speakers, but they will be going out and I'd like to aim the ports so they fire from the previous speaker cavities.

    The setup is going to be 2 e3.8 woofers by Elemental Design.

    They will each be getting about 100rms from a nine.4 amp, also be eD.

    I'd like to keep the enclosure as narrow as possible, and here is what I came up with for the box dimensions. What I need help with is finding the port size and type, and the placement of the ports as well as the subs.

    Here is what I came up with.

    Rectangular Box
    Height 15"
    Width 35"
    Depth 7"

    The sub specs are as follows:

    Qts: .30
    Qes: .38
    Qms: 3.5
    Fs: 23.00Hz
    Re: 7.4
    Vas: 45L
    Mms: g
    Bl: 15.34T*m
    SPL: dB
    Sd: 231cm²
    Xmax: 14.1mm
    Voice Coil: 38mm

    Magnet Width: 4.800"
    Cutout Diameter: 7.250"
    Mounting Depth: 4.375"
    Weight: 10lb
    Total Height: 4.900"
    Displacement: ft³
    Outside Diameter: 8.375"

    And the recommendation for box sizing is:

    Vented ( ideal )
    .5ft³ Tuned to 30Hz

    Vented ( DDLoud)
    .7ft³ Tuned to 35Hz

    I see a lot of people going with the slot/square ports now, and not so much the round plastic ports. Is there a reason for that? I'd like to stick with the round ports, as they seem to be more idiot-proof. What I need is dual ports, and also having them as close to the edge as possible so I can aim them into the factory deck opening.

    I'd appreciate any pointers or help. If you need more information, I'll do my best to provide it to you.



  2. #2
    hatemonger's Avatar
    hatemonger is offline funded*by*soros

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    Denver, Co
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    Re: Advice for dual 8" ported build

    is there enough room on the rear deck to fit (2) 8 inch subs and (2) 4 inch aero ports? and port length changes depending on box size. the box won't be all that deep (up/down) if it is stretched across the entire length of the rear deck, which will probably pose an issue with having to bend the round ports. i personally don't do that. if the port is too long to do a straight shot with an aero, i use slot ports instead. your design would work fine also, but you'd possibly lose the rear cushion to the back seat. i haven't seen the interior, but firing those subs too close to the back of the seat would be an issue.

    2003 chevy s-10 ext. cab
    hu: jvc kd-avx1
    precision power 356cs components
    front amp: infinity 475a
    sub: diamond audio d6 10d4
    enclosure: 1.1 cubes ported tuned @ 31hz
    sub amp: JL G1700

  3. #3
    Pioneer~Saturn's Avatar
    Pioneer~Saturn is offline Dr. Enclosure

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    Dayton, OH
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    Re: Advice for dual 8" ported build

    If you need anymore help just hit me up, but I think what we came up with is the only way to go really

    <First and only dual-alternator 'real' Saturn (pre 2002) on the planet>
    Team Concepts, Team Shok Industries Team XS Power
    Soon: Mystery subs + AQ20k
    12.75 cubes net ~25Hz tuning 200 sq inches of port (lowz?)
    AC position- 250 amp alt
    Stock alt position- 225 amp alt
    (2) XS Power D3100's
    4 power+ 4 ground runs of 1/0-gauge to rear
    152.1 @ 40Hz legal, certified...just getting started.

  4. #4
    IDSkoT's Avatar
    IDSkoT is offline Resonating Reticular

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    Jan 2008
    Miami, Florida
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    Re: Advice for dual 8" ported build

    2x 4" aeros? That's ridiculous. That's the full area of a single woofer. Bigger enclosure, smaller ports

    Now designing / building boxes.
    (Only building sealed and aero port boxes.)
    PM me.

    Feedback Thread

    Refs: MSW Danny, atsaubrey (great seller), ampjunkielikeme, wgsj_fortvalley, tEh koRnDog, bad @SS chevy, Nismos14 (who is the man. )

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