Car Woofer box.

Discussion in 'Home Theater Projects' started by Mike_Ped, Jul 13, 2003.

  1. Mike_Ped

    Mike_Ped Second Unit

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    Hi.

    I built a sonotube about a year ago and was really pleased with the results.

    So recently, I got my hands on a car woofer and amp for really cheap and have deccided to try my hand at building a box.

    I've got a few questions for ya:

    1) I can't recall the name of the program I used before which allowed me to measure the results a certain box/tube would give. Anyone refer me to the latest and greatest program?

    2) In a car trunk, should it be ported or sealed? I don't want a ton of bass...just some support.


    3) Anything else you folks can school me on would be great!


    Thanx in advance!


    Car Woofer: Rockford Fosgate 12" RFP3412 ($10)
    Amp: Rockford Fosgate Punch 150S ($60)
     
  2. Steven Kephart

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    1. The best free box building program is WinISD Pro alpha. Make sure you download the Pro. You can find it at www.linearteam.org .

    2. This really depends on you. The sub they include in WinISD is the 2412. So if they didn't make any changes, then the sub seems to require a very large box (for cars). .707 alignment showed up at 3.6 cubes sealed. So ported might take up too much room. But since you don't want huge output, I would say go sealed.

    Good luck with your project.
     
  3. Mark gas

    Mark gas Second Unit

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    go with sealed


    here is what rockford recomends

    Sealed box -

    Recommended Minimum Volume (Cubic feet) - .9



    Recommended Maximum Volume (Cubic feet) - 1.75



    Ported box -

    Recommended Volume (Cubic feet) - 2.0

    http://www.rockfordfosgate.com/subwoofers/
     
  4. JoeFish

    JoeFish Stunt Coordinator

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    3.6 cubes?!? Jinkies! I'm spoiled by my 12" MTX 7000 series, 1.25 cu ft sealed. Anyway...

    2. The reason I chose a sealed box over a ported box in my vehicle is the sound. A ported box will give you a much harder hit for the same subwoofer, but a sealed box will be a tighter, more accurate bass. That's my kind of bass [​IMG] The air behind the woofer acts like a spring, controlling the movment of the cone. Whereas in a ported application, there is much less of a buffer effect, and the cone is free for more excursion.

    So, the sealed box will be smaller and more accurate, but you'll lose some db. It's a tradeoff I was more than willing to make, and my box still slams.

    -Joe
     
  5. JoeFish

    JoeFish Stunt Coordinator

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    Oh, and if you want to make the box even smaller, you can stuff it full of poly-fill, the stuff they put in pillows. Some folks claim you can make the box 1/2 the cu ft, but I've never tried it myself. My boxes have plexi so you can see the beautiful woofer [​IMG] You'll want to ask around about that first.

    -Joe
     

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