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    82 cutlass's Avatar
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    4th order

    I'm about to do a 4th order through the rear deck of my town car . 2 sundown sa 15's . How much port do you guy's think would be a good start ? Box is going to be 4 cubes sealed...8 ported tuned to 48hz. on 1500 watts . I'm thinking around 120-140 inches of port . Or should I go with more being on 1500 watts ?

    Thanks for any help







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    Re: 4th order

    180-200



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

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    Re: 4th order

    What are your goals?

    You dont want anywhere near 200in^ of port. And 8 cubes ported isnt necessary.




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    Re: 4th order

    I would stick with 120-140 on the port. Too much and it might be a bit too peaky for your liking




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    Re: 4th order

    Yeah, 200in^2 is way too big. Usually if you stay around 1/3-1/2 of the woofer's sd, then you're good. In this case, that would be about 100-125in^2 or port area.



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    Re: 4th order

    Quote Originally Posted by nicholasmccabe View Post
    another ecellent designer as far as i can tell
    yah bro he is i asked him some questions and he got me lined out quick. told me 4 cuft tuning 32. im gonna go get some chip bord and nails tomorrow and build my first ram designs box!




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    Re: 4th order

    I'm looking at doing a 6th or 8th order in my town car, any inputs?




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    82 cutlass's Avatar
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    Re: 4th order

    Quote Originally Posted by galacticmonkey View Post
    What are your goals?

    You dont want anywhere near 200in^ of port. And 8 cubes ported isnt necessary.
    Loud and low...daily pounder . I'm thinking like 4 sealed and 6 ported tuned to around 48-50 hz. With like 120 in. of port to start . I'll build it so I can change the port if necessary .




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    Re: 4th order

    Quote Originally Posted by RAM_Designs View Post
    Yeah, 200in^2 is way too big. Usually if you stay around 1/3-1/2 of the woofer's sd, then you're good. In this case, that would be about 100-125in^2 or port area.
    I was thinking around 120in^2 to start . How's 4 sealed and 6 ported tuned around 48-50 hz. ?

    Thanks for the help guys




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    Re: 4th order

    You can just throw numbers out and expect superior results. but what i recommend in this case is to listen to McCabe had to say. Same drivers and he went through quite a bit of changing before something was desirable. That kind of experience is fully necessary when dealing with bandpasses rather than throwing out numbers and going with a generic 2:1 ratio.

    But for informational purposes, 200sqin can work well if the design allows it to. But the room needed may be quite large. Not to say that certain more complex designs can be scaled but i would not recommend using just a numbered recommendation with the full understanding of the design as a whole.

    The great thing about 4th orders, is phase control can be less important than in a combined phase design idea, so generally, if you want to stick with just numbers for designing a forth, it will work......just might not be what you want in the end.
    Either way, good luck on the build and i hope it works for you! Keep us updated!
    By using a designer, you will get much better results than just, "try this.....".





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    Re: 4th order

    Quote Originally Posted by nicholasmccabe View Post
    i dont have near that amount of ported area, but my trunk isnt quite as big as yours either. i went with 100sqinch of port throiugh myvery knoledagble rear armrest, and im happy with it. 1500 watts on 2 sa 15s. 120 would be probubly close to where u need to be, stay within what ever gmonkey has for u on his advice. worked really well for me, and noone else seems to know quite as much about actual results for a 4th order, they just have the programs and software capabilities, which is ok , but for actual results gmonkey seemed to be most helpful


    Can u smellllllllllll, what the rock is cookin?!!!
    Seen your video's on youtube...nice job . How's it sound now after you made the port bigger ?




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    Re: 4th order

    I need to do this in my grand marquis...



    Headunit - Stock cassette player - Pioneer P9400
    Front Stage - Pyle 8 inch subs (1000 watt peak!!) - Polk DB6.5 (about to be CDT 6.5s)
    Rear stage - Deleted (stolen) - Deleted
    Sub stage - custom built 15 inch sony xplod (5k watt peak!!!) (huge box) - Two SA12's built by Corey
    Sub amp - Pyle 8000w peak!! (spl edition) - AQ2200
    Electircal - 35 amp alt from ford festiva upgrade, stolen battery, 28 gauge solder coil for my cable - Dual D34 Yellows, 1/0 trystar OFC, 135amp alt

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    Re: 4th order

    Quote Originally Posted by Moble Enclosurs View Post
    You can just throw numbers out and expect superior results. but what i recommend in this case is to listen to McCabe had to say. Same drivers and he went through quite a bit of changing before something was desirable. That kind of experience is fully necessary when dealing with bandpasses rather than throwing out numbers and going with a generic 2:1 ratio.

    But for informational purposes, 200sqin can work well if the design allows it to. But the room needed may be quite large. Not to say that certain more complex designs can be scaled but i would not recommend using just a numbered recommendation with the full understanding of the design as a whole.



    The great thing about 4th orders, is phase control can be less important than in a combined phase design idea, so generally, if you want to stick with just numbers for designing a forth, it will work......just might not be what you want in the end.
    Either way, good luck on the build and i hope it works for you! Keep us updated!
    By using a designer, you will get much better results than just, "try this.....".
    Thanks...Yeah I hear ya...don't know till you build it . Build and maybe build again to get the results




  14. #14
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    Re: 4th order

    Quote Originally Posted by SourDeez View Post
    I need to do this in my grand marquis...
    Do it up...




  15. #15
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    Re: 4th order

    Quote Originally Posted by 82 cutlass View Post
    Do it up...
    Not sure where to start.. maybe I should just crash it into a dairy queen then buy a tahoe



    Headunit - Stock cassette player - Pioneer P9400
    Front Stage - Pyle 8 inch subs (1000 watt peak!!) - Polk DB6.5 (about to be CDT 6.5s)
    Rear stage - Deleted (stolen) - Deleted
    Sub stage - custom built 15 inch sony xplod (5k watt peak!!!) (huge box) - Two SA12's built by Corey
    Sub amp - Pyle 8000w peak!! (spl edition) - AQ2200
    Electircal - 35 amp alt from ford festiva upgrade, stolen battery, 28 gauge solder coil for my cable - Dual D34 Yellows, 1/0 trystar OFC, 135amp alt

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