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Reload Thread: The 4th order thread

  1. #91
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    Re: The 4th order thread

    Quote Originally Posted by Buck View Post
    I'm sorry

    So those are sa-12's you are running? What's the specs of the box now?
    yes, sa12s, rear chamber is 2 cubes. thats all im giving out lol



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

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  3. #92
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    Re: The 4th order thread


    heres the innards though lol



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

  4. #93
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    Re: The 4th order thread

    Yes, that's what I've used on them as well.



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    Re: The 4th order thread

    Quote Originally Posted by Buck View Post
    Yes, that's what I've used on them as well.
    id go smaller, but the tahoe peaks so low, theres not point to it. and if one were to go smaller, the woofers would be getting beat on fur sure... I doubt the surrounds would hold up lol. but 1-1.2 is optimal.



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

  6. #95
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    Re: The 4th order thread

    There is a certain trust or faith you have to have with people when it comes to mechanical failure. I say that because you have to assume people will test the limits of that box, so it's fair to give a little over-excursion room, as in more cone control. So I think long and hard about the size of my chambers.

    If you know what I mean



    ***ONLY TAKING IN BOX BUILDS ATM***
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    Re: The 4th order thread

    Quote Originally Posted by Buck View Post
    There is a certain trust or faith you have to have with people when it comes to mechanical failure. I say that because you have to assume people will test the limits of that box, so it's fair to give a little over-excursion room, as in more cone control. So I think long and hard about the size of my chambers.

    If you know what I mean
    ******, the way I like it.



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

  8. #97
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    Re: The 4th order thread

    One guy was running almost 8 cubes with 4 12's to achieve the Fc he wanted. I understand that, but for most I wouldn't feel comfortable doing that even if the numbers did match up. If it was my box, wouldn't be a second thought about it because I know how to spot problems. That's why bandpasses are fun. Trying to get the best performance while trying not to mechanically destroy your woofer. Maybe that's the name of the game.



    ***ONLY TAKING IN BOX BUILDS ATM***
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  9. #98
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    Re: The 4th order thread

    Quote Originally Posted by Buck View Post
    One guy was running almost 8 cubes with 4 12's to achieve the Fc he wanted. I understand that, but for most I wouldn't feel comfortable doing that even if the numbers did match up. If it was my box, wouldn't be a second thought about it because I know how to spot problems. That's why bandpasses are fun. Trying to get the best performance while trying not to mechanically destroy your woofer. Maybe that's the name of the game.
    one thing I learned, small rear chamber=more port larger rear=less port. Im as small as I want to go rear chamber wise, but I still only have like .25" of excursion, now, since I have a large ratio, the woofers arent pressurizing the enclosure as I wish they were, thats why im chopping the port down. That will give me a higher tuning, and more excursion at my peak.



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

  10. #99
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    Re: The 4th order thread

    Quote Originally Posted by RangerDangerV2 View Post
    one thing I learned, small rear chamber=more port larger rear=less port. Im as small as I want to go rear chamber wise, but I still only have like .25" of excursion, now, since I have a large ratio, the woofers arent pressurizing the enclosure as I wish they were, thats why im chopping the port down. That will give me a higher tuning, and more excursion at my peak.
    smaller chamber = higher Fc. The higher you tune, the higher your vent mach is given same power and port area. So it makes sense why your port velocity would increase when you shrink the rear chamber based on that logic.



    ***ONLY TAKING IN BOX BUILDS ATM***
    **We do accept full car builds, as in full installs**
    Find us on Facebook and Instagram!

    Alpine - ASE (local) - Batcap - C&D Tech - CT Sounds - DC - eD - Excessive Amperage - Rainbow
    In Nashville? Me too! Pm me and come hangout!

  11. #100
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    Re: The 4th order thread

    ok so vas:46/Vb:2.2=20.9 + 1 = 21.9, sqrt = 4.6 x Fs:27 = 126, which should be my Fc of my rear chamber right? it seems really high. am i messing something up?




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    Re: The 4th order thread

    Quote Originally Posted by noble brown View Post
    ok so vas:46/Vb:2.2=20.9 + 1 = 21.9, sqrt = 4.6 x Fs:27 = 126, which should be my Fc of my rear chamber right? it seems really high. am i messing something up?
    vb needs to be in liters. you have to convert it from cu ft.



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

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    Re: The 4th order thread

    specs claim the 46 is in liters. a missprint?




  14. #103
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    Re: The 4th order thread

    Quote Originally Posted by noble brown View Post
    specs claim the 46 is in liters. a missprint?
    vas is in liters. you need your Vb to be in liters as well.



    1999 Tahoe
    2 sa12s
    4th order
    145.18 @33z... with less than 500 watts!

  15. #104
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    Re: The 4th order thread

    wouldnt that give me an even larger number, 46 cuft is 1302 liters

    ---------- Post added at 11:21 PM ---------- Previous post was at 11:21 PM ----------

    oh ok

    ---------- Post added at 11:22 PM ---------- Previous post was at 11:21 PM ----------

    duh




  16. #105
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    Re: The 4th order thread

    ok so Fs of rear is 35hz. i multiply this by my desired ratio... whats my next step




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