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    Potential box design for an XFL 15"

    I currently have 3 Soundstream Picasso 12"s on a box I built myself a year ago (5.5cf 32hz 52sqin port) and have been told by many my port area is ridiculously small which I agree with. Rather than just build a new box for them I've decided to upgrade to an XFL 15". My current thoughts now are 4 cubes tuned between 30-32hz with 64 square inches of port.

    What I don't like about my current setup is that the subs face the back and are pretty much on display as it's a hatchback. So I'm hoping to go with a downfiring setup, but while I'm at it go with a horn type design. I've done calculations to see if the sub is suitable for a downfiring setup and with such a stiff suspension it's fine. This is a general idea of what I'd like to do.



    Would this be very hard to do? I'm hoping to have around 4" breathing space for the port at the minimum then go increasing in size. I'm really just after thoughts on this design and any tips I should take into account for example the angle of the horn coming up. Which btw the larger end will be facing the driver so the port exit will be at the far back of the car.

    Cheers.







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    Re: Potential box design for an XFL 15"

    Anyone got any tips for this design?
    Like how tuning may be affected by doing this... I'd need a horn decent angle not to...




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    Re: Potential box design for an XFL 15"

    No ones got anything?

    Surely box designers could throw some input in.



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    Re: Potential box design for an XFL 15"

    have fun with the tapped horn thing. LOL going to be lots of testing/math if you want to get a good response. but if you can make it work, then props




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    Re: Potential box design for an XFL 15"

    A 4th order would be much easier to design and be very loud.



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    Re: Potential box design for an XFL 15"

    Quote Originally Posted by T 2 View Post
    A 4th order would be much easier to design and be very loud.
    not as loud as a correctly built tapped horn.




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    Re: Potential box design for an XFL 15"

    Quote Originally Posted by DbDesigns View Post
    not as loud as a correctly built tapped horn.
    Key word correctly. It would be a PITA



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    Re: Potential box design for an XFL 15"

    Quote Originally Posted by T 2 View Post
    Key word correctly. It would be a PITA
    so? would be a great learning experience. and loads of potential with a horn design. they can play a very wide bandwidth play it very flat. also, they can be very loud because they are so efficient.




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    Re: Potential box design for an XFL 15"

    Quote Originally Posted by DbDesigns View Post
    so? would be a great learning experience. and loads of potential with a horn design. they can play a very wide bandwidth play it very flat. also, they can be very loud because they are so efficient.
    If he's up for all the work, by all means he can go for it. The advantages over a 4th order aren't worth the trouble IMO, but that's just me.



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    Re: Potential box design for an XFL 15"

    Quote Originally Posted by T 2 View Post
    A 4th order would be much easier to design and be very loud.
    Whats a good way to design one? I'm willing to make the box bigger if it's 4th order because getting the sub out of the box would be a PITA (one of my goals here is to hide the sub so that works out great).
    I've tried on winisd but I'm not getting a great response from it...

    also wouldn't this be better in a 6th order? since it's made for ported I figured having a port in the rear chamber would make it feel at home.
    I've also read since the suspension on these is so stiff they're really bad for bandpass right out of the box so i'd give it some "break in" time free air to loosen up the suspension before i do it.

    Quote Originally Posted by DbDesigns View Post
    so? would be a great learning experience. and loads of potential with a horn design. they can play a very wide bandwidth play it very flat. also, they can be very loud because they are so efficient.
    Don't tapped horn designs require a lot of space?




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    Re: Potential box design for an XFL 15"

    Any reason you didn't do the port like this?


    Don't know if it would make a difference, but my thought would be that air would flow a little easier without that 90* bend. Just a thought, I could be completely wrong here, lol.




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    Re: Potential box design for an XFL 15"

    One idea is making just a normal upfiring ported enclosure with a false wall. Get some acoustically transparent material and go to town. Would keep the sub hidden and also be much easier to build. Would look pretty nice to if you put the time in.

    Just a thought.

    Anyone done a xfl in a 4th or horn?



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    Re: Potential box design for an XFL 15"

    screw it... either go quasi 8th order or ABC enclosure.




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    Re: Potential box design for an XFL 15"

    You could always down fire the sub with the port firing back if you absolutely had to.



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    Re: Potential box design for an XFL 15"

    Quote Originally Posted by oxsign View Post
    Any reason you didn't do the port like this?


    Don't know if it would make a difference, but my thought would be that air would flow a little easier without that 90* bend. Just a thought, I could be completely wrong here, lol.
    You are correct, I just thought it would be a pain to cut more wood on angles lol, but after this discussion I don't think I'll be going with that design.

    Quote Originally Posted by Better-Action View Post
    One idea is making just a normal upfiring ported enclosure with a false wall. Get some acoustically transparent material and go to town. Would keep the sub hidden and also be much easier to build. Would look pretty nice to if you put the time in.

    Just a thought.

    Anyone done a xfl in a 4th or horn?
    That is an awesome idea, just need to figure out where to get some and if I can get the same colour as the rest of the cars carpet (kindof a light brown)

    I'm really looking forward to further suggestions on 4th or 6th order designs though because this thread has seriously got me started looking at those type of designs... I wouldn't mind having a box with 2 wooden holes facing up...

    Quote Originally Posted by T 2 View Post
    You could always down fire the sub with the port firing back if you absolutely had to.
    Problem with that is both space and port breathing space, I don't have a lot of room to work with.

    Thanks to suggestions I'm keen on both the bandpass designs and the acoustically transparent material as a last resort or maybe as an addition to it to even maybe hide the ports lol. I really like the hidden + security factor of the bandpass design. I only show a few good mates what I have in my boot even though currently it's only 3 soundstream 12"s which aren't worth much lol.




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