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Old 08-30-2009, 04:47 PM
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Default Questions on box for 9515d - Port bending and more..

Ok i am going be running a single DD 9515d in a slot ported box. This is going in the trunk of a 93 continental. I need some help with port bending, as well as getting the right box volume. Ive built some crappy boxes using the port and volume calculators on the12volt.com and such, they turned out alright got pretty loud. But now im ready to build a NICE box with the proper wood and everything. I do not have an amp yet, so power is unkown right now, planning for 1.5k and up, preferably 2k or more if i can.

Now, i have the max dimensions where i want the box fitted, but not the depth, as thats going to determine my box volume. The box WILL be 16" high, and 36" wide. Right now my plans are both sub and port firing towards the back of the car. Is this good or not? Will i need to worry about the port or sub loading off of anything? Itll be a bit of space left between the sub/port and the rear of the trunk.

Being i want the port firing the same way as the sub, the port will need to be deeper than the box is, which means ill have to bend it. Im unclear on how you measure it. I know you have to stay the width of the port away from the rear wall. But when i measure the length of the port, do i measure down the center of the port? And when i get to the turn, still stay measuing down the middle of it?

Ive thrown some numbers into the box calculators and figure the box will be AROUND 20 or so inches deep after sub and port displacement. To get around 4.5 cubes.

What would you suggest tuning this sub to? I want it to get as loud and pound good. I listen to rap if that matters. I want it to hit pretty hard. I was thinking about 38-40hz but honestly dont know. Im fairly new to building boxes, obviously.

I remember the RE box calculator can do most of that stuff for me, but i hear sometimes that its not really that accurate. Should i use it or just do all the calculations with like volume/port calculators on the12volt.com?
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Old 08-30-2009, 05:24 PM
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Ok so when i take out the sub and port displacement.. When do i do that

I have to take out the port displacement after i find out the lenght of the port, right? This is very confusing. I dont even know how to put it into words.


Honestly, if someone is good with boxes and doesnt mind throwing the plan together for me that would be awesome. It just needs to be 16" high, 36" wide, and almost whatever size deep to get the correct box volume after port and sub displacement. The sub should take up .2331 of space from the DD site. And then however much port area i should have, around 70-80 sq in. i do believe.
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Old 08-30-2009, 05:53 PM
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That is the box that I'm working on right now. Well, actually, it's done, just waiting on gear to get here and time to build it... The line through the middle of the port is the line I measured to check the port length. I always model my boxes up (after running some calculations to figure out about what I need) in SolidWorks 2008. It's a great program that allows me to be very precise (without going to crazy odd numbers, my box is within 19 cubic inches of my goal) with designs.

When it comes to subtracting volumes, the only ones I worry about are sub volumes. This is because when I measure my enclosures (after they're modeled up) I only measure the areas that the subs are going to be in, without taking into account the port. In other words, I measure the volume that the subs are going to see, and the port is only important when I set my external dimensions.

As for what calculators to use, I use a Ti-84 pro silver and a piece of paper and pencil... Nah, really though, the RE calculator is a good place to start, and check it with the one on the12volt. Whichever ones you use, check them with a different one, or if you do it by hand (like I do, thanks to doug giving me the formula) just make sure you double check it.

Hope that helps...
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Old 08-30-2009, 05:59 PM
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Thanks for the post. That should help me out some. Hopefully i can get this figured out, dont want to build a box and not even know that when its built its not the right size, or tuned totally wrong or whatever.
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Old 08-30-2009, 07:18 PM
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When you get a design done, or what you think is done, post it up, and somebody (or a few somebodies) will check it for you...
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Old 08-30-2009, 07:21 PM
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I will do that. Ill be doing a sketchup with google sketchup and ill post the dimensions also.
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Old 08-30-2009, 07:34 PM
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Ok now im REALLY confused. I tried putting it into the RE box calculator..

Its saying

port length one - 15.25
port lenght two - 4
total port length - 27.5 WHY?? and how does it get 27

frequency - 35

No matter how i change the port lenght for length two, it wont go higher than like 37 i think, and thats when i put zero on the port length two.

The dimensions are 36 wide, 16 high, and 21 deep. With a 5 by 14.5 port. I raelly am confused even more now with this stupid calculator. I swear i did it earlier and it seemed right, but now it doesnt.
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Old 08-30-2009, 07:47 PM
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It's because the true port length isn't the same as the length of the boards. I just looked through my photobucket, and don't have what I was looking for, but you have to add more length onto the end of the port. You draw a line at a 45 degree angle from the end of the port to the back wall, then measure to the middle of that line. That will give you actual port length.
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Old 08-30-2009, 07:52 PM
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What do you think i should tune the box to? Anyone got any idea? If not im just going to tune it anywhere between 35 and 40 cuz i dont know.
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Old 08-30-2009, 07:54 PM
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Also why can i not tune the damn box any higher on the RE calculator? Its not letting me change it so its tuned higher than 35hz which is when i put ZERO in the second port lenght part, any bigger numbers and its tuned even lower.
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