box for 4 15s

I need a box desing for four 15 they require 3.5 cu ft air space ported I never built a box befor this will be my frist don't got much space depth 16inchs hight 40inchs width43inchs help me some one

-------------
Bang bang boogie

So you need at least 14 cu ft of airspace? Do you have that much space available in the vehicle? 14 cu feet is about the size of a large soda machine or refidgerator https://www.sears.com/frigidaire-14.1-cu-ft-upright-freezer/p-04607071000P

If you don't have that much space the next best reccomendation is to not use 4-15's.

-------------
I can not explain to you what "nothing" is in a scientific way. What makes matters worse is you won't notice it when you finally have the opportunity to experience it.

Actually it seems you might. To determine the cu ft you multiply lenght x width x height and then divide that by 1728. Seems at least outside measurments you have 15-16 cu ft to work with. So built 4- 3.5 cu ft ported boxes.

-------------
I can not explain to you what "nothing" is in a scientific way. What makes matters worse is you won't notice it when you finally have the opportunity to experience it.

I built that box it is like size of a small refrigerator uh I got a Dodge van a b 2500 conversion it be hard iTunes 37 hurts

-------------
Bang bang boogie

what subs do you have?

you probably wont have enough space... its too tight

for example:

say you use 3/4" MDF, since the subs are big you need the thickness.

3/4" wall - 2" space - 15" sub - 2" space - 3/4" wall - 2" space - 15" sub - 2" space - 3/4" wall

you need the 2" space for sturdyness and to screw the subs in. total width = 40 1/4", you have 43" so 2 inches clearance (mount the amp maybe?)

that would be for 2 subs it will look like
_____
| O | O |

make 2 of them attached together and you can have 4 subs on 1 face, looking like

_____
| O | O |
| O | O |


let me assure you this is going to be a heavy box...

btw this gives you roughly 3.34cu ft per sub if you use all 16" deep available.

cant give exact measure without knowing actual sub dimensions

remember that cone of the sub that sits in the box takes up space...some subs up to a 1 cu ft.....dont make the box too small or those subs will only last you a year.

isobaric?

-------------
yuk
quiet rural missouri, near KC.
If your system moves you physically and not emotionally, you have wasted your money.

Isobaric would be a waste with 15's. Why spend the extra money and have the additional weight for moving the same air volume as 2 -15's could move. Better off just going with 2 good 15's or mulitple smaller subs if space is an issue.

Now on the other hand there are occasions where an isobaric setup is advantageous such as if you were really limited with space but want a lot of power. Granted it will not be the same as using 2 subs in seperate enclosures you can drive twice the power into it and fake the VAS of the sub out or in other words get a sub into a box that is half it's recommended airspace but can handle twicw the power.

As far as what napkinthief posted I would suggest using something sturdier then 3/4 MDF for 15's unless it is a cheap setup. A good 15 should use high density board instead of MDF and I would want a larger thickness. As far as saying the "cone" can take up to a cubic foot in the enclosure I rhink you meant the basket/magnet assembly, not the cone. Granted the basket/magnet can take up some airspace you might want to do a little reasearch. I can't imagine a basket/magnet assembly taking up a cube unless it was the size of a freaking warhead. Generally the basket/magnet assembly take up a very small amount..around 10% is the average.



-------------
I can not explain to you what "nothing" is in a scientific way. What makes matters worse is you won't notice it when you finally have the opportunity to experience it.