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    GearGuy2001's Avatar
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    4th Order Bandpass Help

    How the heck do you design one, Ive looked and looked but I dont see anyone call out specifics of the box size and tuning.

    I think my next box is going to be a single 15" RD Audio Alphamax off a 3000d in a bandpass with ports into the cabin, similar to shiznilti's lexus

    I have room for 2-3 6" ports into the cabin if need be and below is a picture of my trunk.



    Directly between the trunk and rear seats is my gas tank so I think the best way is to run some pvc aero ports out of a bandpass box up through the old 6x9 holes in my rear lid (I dont have any rear speakers)

    I PM'd 80 Inches but I figured Id post up and get other opinions also, Im open to designs but I want it to be loud.



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    Re: 4th Order Bandpass Help

    3cuft sealed rear chamber, 3cuft front chamber with (2) 6'' ports, starting with around 15'' lengths. Shorten to tune to your taste, most end up around 12'' in length on the ones i've built, but all interiors vary, so its easier to start long and shorten the port for tuning. If you need to go smaller with the box, reduce the same amount from each chamber to maintain an equal ratio between the front and rear chambers. I wouldn't go any lower than 2.5cuft per chamber for a 15'' sub. Just a suggestion from what has worked well for my bandpass builds.




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    Re: 4th Order Bandpass Help

    Quote Originally Posted by DEAFWISH View Post
    3cuft sealed rear chamber, 3cuft front chamber with (2) 6'' ports, starting with around 15'' lengths. Shorten to tune to your taste, most end up around 12'' in length on the ones i've built, but all interiors vary, so its easier to start long and shorten the port for tuning. If you need to go smaller with the box, reduce the same amount from each chamber to maintain an equal ratio between the front and rear chambers. I wouldn't go any lower than 2.5cuft per chamber for a 15'' sub. Just a suggestion from what has worked well for my bandpass builds.
    actually he can...i would do no more than 2 cubes sealed for 1 15...and make the ported chamber as big as possible and tune the ported chamber to the frequency of his ride...he will still hit the lows regaurdless
    but looking at ur trunk u have room for a 6th order....that would be nice and loud ...when done correctly
    80




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    Re: 4th Order Bandpass Help

    Quote Originally Posted by 80INCHES View Post
    actually he can...i would do no more than 2 cubes sealed for 1 15...and make the ported chamber as big as possible and tune the ported chamber to the frequency of his ride...he will still hit the lows regaurdless
    but looking at ur trunk u have room for a 6th order....that would be nice and loud ...when done correctly
    80
    I sent you a PM back with my max dimensions. Are there any advantages/disadvantages of a 6th order?

    Also with my 33hz box my car peaks at 44hz on the TL



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    Re: 4th Order Bandpass Help

    6th order is more efficient than 4th order boxes...depending on the design

    80




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    Re: 4th Order Bandpass Help

    Quote Originally Posted by 80INCHES View Post
    6th order is more efficient than 4th order boxes...depending on the design

    80
    Well if you could design something up based on my PM'd specs. 6th or 4th order, you choose (or both) Id be glad to send you a few $ via paypal.



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    Re: 4th Order Bandpass Help

    Your trunk lay out kind of *****. I was wondering how you design these while playing with winisd the other day. Listening to some computer speakers with a 6th order that sounds good.
    There any faqs around on designing these?



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    Re: 4th Order Bandpass Help

    Im glad you started this thread, I have a very similar style trunk and though about using a pair of high powered 10s like some DC Level 4LVL in a 4 order but putting the box on the rear shelf, or basicly the gas tank.

    Im very interested how this turns out, ill be taking notes



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    Re: 4th Order Bandpass Help

    Quote Originally Posted by vellocet View Post
    Your trunk lay out kind of *****. I was wondering how you design these while playing with winisd the other day. Listening to some computer speakers with a 6th order that sounds good.
    There any faqs around on designing these?
    Yeah I know my trunk ***** haha

    http://www.the12volt.com/caraudio/boxes4.asp
    and
    http://www.the12volt.com/caraudio/boxes6.asp

    Those are the only tuts I found, lots of websites just copy that info (sometimes without even rewording it).

    Quote Originally Posted by tez4life View Post
    Im glad you started this thread, I have a very similar style trunk and though about using a pair of high powered 10s like some DC Level 4LVL in a 4 order but putting the box on the rear shelf, or basicly the gas tank.

    Im very interested how this turns out, ill be taking notes
    Yeah I dont know if you could get enough cubes to fit on the rear shelf with 2 10s. I supposes its possible, I know that rear shelf is huge. My main goal is to get loud in the cabin and without porting everything into the cabin (like a bandpass does) I was worried about "Timing" issues in the sound.



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    Re: 4th Order Bandpass Help

    you Marquis will get loud with a ported box

    if you decided to run DD then i have a box for you already.



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    Re: 4th Order Bandpass Help

    Joker's car was quite loud with a single 9515 in a ported box. You might have room for 2 15's ported...




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