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    Rule of Thumb

    How many sq inchs of port area are you supposed to have per cube ft of air sapce?



    2005 Chevy Malibu
    Head unit: Pioneer Premier p680mp
    Frontstage: 2 pairs or Diamond Audio D661s
    Subs: DC Sound Labs Level 4 12"
    Box: 2.4cubes tuned to 33HZish
    Amps: MTX 1501d and MTX 942
    Wires: Knukonceptz 1/0 and Krystal RCA cables
    Video: Power Acoustik headrest mointors and DVD player
    Other: Louis Vuitton highlights through out car




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    Re: Rule of Thumb

    12-15




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    Re: Rule of Thumb

    thnx.



    2005 Chevy Malibu
    Head unit: Pioneer Premier p680mp
    Frontstage: 2 pairs or Diamond Audio D661s
    Subs: DC Sound Labs Level 4 12"
    Box: 2.4cubes tuned to 33HZish
    Amps: MTX 1501d and MTX 942
    Wires: Knukonceptz 1/0 and Krystal RCA cables
    Video: Power Acoustik headrest mointors and DVD player
    Other: Louis Vuitton highlights through out car

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    Re: Rule of Thumb

    Port area depends way more on the driver used and the amount of power applied than it does on the box volume. I've used less than 8in^2 per cubic foot and I had no port noise! I have also had 15in^2 per cubic foot and gotten port noise!

    It's a terrible rule of thumb coined by DD to be used with their subs. If that's what they feel is needed, then great, but it does NOT apply to all subs or enclosures.



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    Re: Rule of Thumb

    ok well sub is a level 4 DC 12", box is going to be 2.75 before displacment of sub and bracing, Im going to tune it to 32hz, ? if I start at 30 hz cant I cut out port and raise the tuneing?

    I just found this...http://img23.imageshack.us/my.php?im...z39sqin0gn.png
    I can use this one? I am also going to kerf the front part of the port... does this just mean that I add 1.5" to the port lentgh?



    2005 Chevy Malibu
    Head unit: Pioneer Premier p680mp
    Frontstage: 2 pairs or Diamond Audio D661s
    Subs: DC Sound Labs Level 4 12"
    Box: 2.4cubes tuned to 33HZish
    Amps: MTX 1501d and MTX 942
    Wires: Knukonceptz 1/0 and Krystal RCA cables
    Video: Power Acoustik headrest mointors and DVD player
    Other: Louis Vuitton highlights through out car

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    Re: Rule of Thumb

    box in sig only has 36 sq in and it works just fine.



    '01 5.9 Dakota R/T
    HU: Pioneer Premier 680
    Front Stage: highs: B&G neo8 planars
    mid-bass: Hi-Vi Research 8" (x4)
    http://www.caraudio.com/forum/showthread.php?t=304095
    Subs: MB Quart Rwe304(x2)
    ported 4 cubes @ 30
    Amps: MB Quart Reference 4x50
    MB Quart Premium 1200.1D(1ohm)


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