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Thread: sub box

  1. #1
    Whistle Tip pimpJ's Avatar
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    sub box

    aight, I'm a total noob to hardware stuff.. so keep that in mind

    I'm making my sub box this weekend and I've seen sub boxes with a plexi glass window in them, and I think that would be kewl to do.

    my main questions are
    1. Is plexi glass actually what I want to use ? plastic ? I dunno.. make some suggestions
    2. Would it totally destroy the sound and purpose of the box ? Like, would I be able to seal it well enough to where it would still sound alright ?
    3. How would I get the plexiglass(or other material) flush to the box ?

    sorry if these are newbish.. I have no idea about any of this stuff.

  2. #2
    pip
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    Maximum Bitrate pip's Avatar
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    I suspect if it is heavy duty plexiglass (1/4 inch) and well sealed it should be ok.
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  3. #3
    Newbie
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    Since you're a newb, I'd start with a simple sealed enclosure that's matched to your subs. Do yourself a favor and buy a speaker design book. The boxes that you're seeing are called 'band pass' and there's actually a fair bit of mathematics that goes into setting one up and tuning it properly...they sound like crap if not properly constructed or properly matched to the subs and the rest of the system. Before you touch one of those, you want to take the next step in complexity up from the sealed enclosure and design a ported enclosure.

  4. #4
    Whistle Tip pimpJ's Avatar
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    alright.

    I feel quite competent in math and I'm willing to learn about the different boxes.. you still reccomend a simple sealed enclosure for the first time ?

  5. #5
    Whistle Tip pimpJ's Avatar
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    also..

    a sealed enclosure + window = bandpass ?
    'cause that's really all I'm going for

  6. #6
    Constant Bitrate sheerdark's Avatar
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    Quote Originally Posted by pimpJ
    also..

    a sealed enclosure + window = bandpass ?
    'cause that's really all I'm going for
    it is usually a ported enclosure + window = bandpass

    And I will also warn you...if you don't get this right...it will sound really bad! I bought a bandpass box from Best Buy with 2 10" speakers in it and it sounds alright for my purposes. However, if I take the plexiglass off the front of the box, you can barely hear anything at all. What this tells me is that fairly a lot of planning went into designing that box for its use. From every angle, the size of the box, the subs used, the wood used, the plexiglass, and the seals, etc....etc... I certainly wouldn't want to build my own bandpass box - but if you go for it...keep us updated and Good Luck!

  7. #7
    Whistle Tip pimpJ's Avatar
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    alright, we'll see how things go. I'll look around a bit more and see if I can find anybody I know who could help if I did decide to go the bandpass route.. we'll see

    thanx

  8. #8
    Variable Bitrate Squid's Avatar
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    A window has nothing to do with whether a sub box is a ported/sealed/bandpass enclosure...
    Just replaces a wood panel so you can see your expensive subs...

    And I too recommend a sealed enclosure for your first box...
    It will give you nice tight/crisp bass response.

    A ported box will "boom" a lot harder tho... if thats what you want...
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  9. #9
    Whistle Tip pimpJ's Avatar
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    ok kewl, sealed box sounds good. I was wondering why a window without a port would make a difference ?
    I may just do a sealed box with 5 walls wood and 1 plexi
    thanx

  10. #10
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    A window in a normal sealed box does nothing but let you see the baskets of your woofers. The boxes that typically have windows have them in the front and are bandpass boxes. IIRC (I haven't messed with box construction in years) the subs are wired out of phase with each other and what you actually listen to is the backwave of each playing through the vents.

    A sealed enclosure is typically the smallest, easiest to construct, and gives tight bass at the sacrifice of some efficiency.

    A ported enclosure will tend to boom and be more efficient *around the tuning frequency*. Tuning is critical as is selecting your crossover frequency. You'll get weird artifacts like 'chuffing' if it's not setup properly. Also, the box would be larger than a sealed box for the same subs.

    Start with the basics, man, and learn how to build a good solid enclosure. Then play with a ported enclosure, then move on and try the band-pass.

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