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Thread: slot porting?

  1. #1
    Low Bitrate frugmonkey's Avatar
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    slot porting?

    i've done a bit of searching, and i'm having trouble finding info on how to slot port a sub box.

    my idea is that i am going to invert my subs so as to reduce the volume of box i need, but i was thinking that i might try and use slot ports to increse power, however my subs data sheet only tells you how to use round ports, and it says they need to be 26 inches long!!! thats nearly as wide as my car!!!

    does anyone know of a calculator or something which i can use to try and work this out?

    my subs are orion H2's and i'm running 1200w RMS to each, and while it is cosiderably loud, i still think theres more to be gained from them!
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  2. #2
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    26 inches long doesn't necessarily mean that they have to be a straight port. You can add in an elbow or two in there and bend the port.

    However, I will note this.

    Usually, ported enclosures are larger than sealed ones...if you're inverting to save space, seems you would consider going sealed as well.
    Jan Bennett
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  3. #3
    FLAC
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    If you're bending the port remember to measure total length down the midpoint and not either edge.

  4. #4
    Maximum Bitrate 3onDubs's Avatar
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    Does the data sheet give you the diameter of the round port that needs to be 26"? If so, you need to calculate the total area of the required port for each sub and make sure that you achieve this with slot ports.
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  5. #5
    Low Bitrate Mandos's Avatar
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    http://www.icixsound.com/vb/article.php?a=8

    Random little thing about the speaker.

    After pulling up the orion site, 1200W to that sub, they suggest a 1.5 cubic foot box w/ 12 sq. in. of port 22.3" long.

    What kind of space are you working with? I could whip up a cut list for you.
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  6. #6
    Low Bitrate frugmonkey's Avatar
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    so i'm looking at say a 1" x 12" port 22.3" long?
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  7. #7
    FLAC
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    frug, that port would be noisy as hell. You're not supposed to exceed a 4:3 ratio on the port dimensions.

  8. #8
    Maximum Bitrate boomintrac's Avatar
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    porting+saving space= never gonna happen like Red said ported enclosures are usually larger when making the ported enclosure you also have to take out for the displacement of the port but I can tell you the H2s like to be in a ported enclosure and will get loud if thats what you want
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  9. #9
    Low Bitrate frugmonkey's Avatar
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    so 4" x 3" would work then, i've never constructed a ported enclosure before, so its all a little confusing! i'm aiming to mush my guts up with bass! i think the rear seats are gonna go anyway cos i only got room for the one extra battery and thats in the spare wheel well, not a good thing when you get a flat tyre on the outskirts of the "seacroft ghetto" and you end up with a gang of hoodie wearing junkies just dying to beat you and steal all your hard work so they can buy a bag of crack!

    i had considered round ports but i'm having trouble sourcing any. i'd heard that JL do a port with a flexible tube that you can bend into almost any shape, but it seems that they have stopped producing them now
    Progress: ~99%
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    boot install to tidy when better weather arrives

  10. #10
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    PVC pipe works great. Grab a few elbows and pipe glue and you're set to go.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

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