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View Full Version : 15" XXX sketchup Box plans



406er
01-05-2008, 12:13 AM
well this is for a guy at work. he was picky about it being symetrical and having a wedge style back so its tight againsts he seats. the box specs out at 6 cu ft net @30Hz. two 18.5X2 ports 32" long. for a total of 74 sq in port area. hes gonna put a USAmps MD3 on each coil, for someware around 3000 watts. let me know if ya guys think is big enough and has enough port area!

once i get the OK, ill be posting pics of the build, well i hope i start in a week

http://pic40.picturetrail.com/VOL356/1929773/16701887/296676629.jpg
http://pic40.picturetrail.com/VOL356/1929773/16701887/296676633.jpg

BuckyBoy
01-05-2008, 12:17 AM
That's ****. Will the area behind the port cause a problem? The first time I have seen it done like that, but I haven't been around long.

IgnoreMe
01-05-2008, 12:18 AM
that sub will be bottoming out in no time.

i could get a 15" xxx to bottom out easily in 4^3ft @ 29hz with a kx2500.1. you need to bring that volume down quite a bit.

406er
01-05-2008, 12:19 AM
no, cause the port it self has been "boxed off" from the wedge shape behind it. its just a good ole fasion labrtyh style port it a funky shaped box

406er
01-05-2008, 12:19 AM
that sub will be bottoming out in no time.

i could get a 15" xxx to bottom out easily in 4^3ft @ 29hz with a kx2500.1. you need to bring that volume down quite a bit.


what year of XXX

IgnoreMe
01-05-2008, 12:20 AM
what year of XXX

there i go assuming again. it was an 05.

still, 6 cubes net for almost any 15 is way to much.

BuckyBoy
01-05-2008, 12:32 AM
no, cause the port it self has been "boxed off" from the wedge shape behind it. its just a good ole fasion labrtyh style port it a funky shaped box
That's what I was talking about. The way you boxed it off and now there is a little nook back there won't affect anything?

406er
01-05-2008, 12:39 AM
there i go assuming again. it was an 05.

still, 6 cubes net for almost any 15 is way to much.

i was told from basicly my mentor that 6 cu ft at 30 would be perfect

406er
01-05-2008, 12:43 AM
That's what I was talking about. The way you boxed it off and now there is a little nook back there won't affect anything?


nope, just adds to the NET cu ft of the box it self

IgnoreMe
01-05-2008, 12:43 AM
i was told from basicly my mentor that 6 cu ft at 30 would be perfect

so is it an 04/05?

Immacomputer
01-05-2008, 12:43 AM
Is that for a newer XXX? If so, that front panel is going to flex or just straight fall apart. Even if it's the older XXX, I would add bracing from front to back and definitely a double baffle. That enclosure does not look healthy enough for a serious sub as it stands.

IgnoreMe
01-05-2008, 12:45 AM
nope, just adds to the NET cu ft of the box it self

unless im misunderstanding, you have net and gross volume confused.

this begs the question, is that truly a 6^3ft net or gross box?

406er
01-05-2008, 12:45 AM
Is that for a newer XXX? If so, that front panel is going to flex or just straight fall apart. Even if it's the older XXX, I would add bracing from front to back and definitely a double baffle. That enclosure does not look healthy enough for a serious sub as it stands.

didnt bother goin to the extream of drawing in the double baffel and the braces. but trust me, they will be there. as well as a brace for the motor


so is it an 04/05? 07

and the gross volume of the box is 8.29 cu ft. once u subtract the port voulmes of .91 each and the sub volume of .27 and the bracing and double baffle, ya get 6 cu ft NET. trust me fellas, i racked my brain on how to get 10 lbs in a 8 lbs bag. this **** is bang ON!

Immacomputer
01-05-2008, 12:48 AM
Drawing the enclosure the way it is to be built is "extream"? What the **** is "extream" anyways?

406er
01-05-2008, 12:50 AM
Drawing the enclosure the way it is to be built is "extream"? What the **** is "extream" anyways?

me typing extreme realy fast

IgnoreMe
01-05-2008, 12:51 AM
didnt bother goin to the extream of drawing in the double baffel and the braces. but trust me, they will be there. as well as a brace for the motor

07

and the gross volume of the box is 8.29 cu ft. once u subtract the port voulmes of .91 each and the sub volume of .27 and the bracing and double baffle, ya get 6 cu ft NET. trust me fellas, i racked my brain on how to get 10 lbs in a 8 lbs bag. this **** is bang ON!

well, i gotta admit. im not familar with the 07's so ill stay out of it.

i was just confused because you said the box is 6 cubes net, but then said that slant adds to the net of the box, when in actuality it is the gross. my brain kinda wandered and i figured the box was instead, 6^3ft gross. let us know how it sounds. many people have said the new XXX's beg for sealed box's though.

406er
01-05-2008, 12:56 AM
well, i gotta admit. im not familar with the 07's so ill stay out of it.

i was just confused because you said the box is 6 cubes net, but then said that slant adds to the net of the box, when in actuality it is the gross. my brain kinda wandered and i figured the box was instead, 6^3ft gross. let us know how it sounds. many people have said the new XXX's beg for sealed box's though.


its EBP says it would perfer sealed, but this is a SQL aplication. though with with 3000watts and tones of cone area, it should be loud eatherway

XaznKewLguyX
01-05-2008, 12:59 AM
me typing extreme realy fast

but extreme is spelled with e's and no a :confused:

tapout
01-05-2008, 01:02 AM
meh, I gotta say....too big and too much powa. Good luck though.

406er
01-05-2008, 01:02 AM
but extreme is spelled with e's and no a :confused:



e a whats diff

IDSkoT
01-05-2008, 01:08 AM
Kudos! What program is that? I've never seen it before! Looks pretty cool.

If you pull this off, you'll have extra Kudos [to do nothing with, basically... but, still]

That looks good. What car is it going into?

406er
01-05-2008, 02:54 AM
the program is sketch up
and the box is goin into a FJ crusier

babaganoush123
01-05-2008, 03:14 AM
whats the easiest program to measure up and design an enclosure for free???

basshedz06
01-05-2008, 07:23 AM
just read the first page i would say by looking at it that u would have a standing wave issue inside the box with that empty cavity space behind the ports. prolly wanna look more into that some and yess 6 cu ft is quite large for one 15 i think two maybe but not one.

but keep it going u will get it somewhere i have been doing it for some years now and don't know it all just yet lol

Immacomputer
01-05-2008, 11:31 AM
just read the first page i would say by looking at it that u would have a standing wave issue inside the box with that empty cavity space behind the ports. prolly wanna look more into that some and yess 6 cu ft is quite large for one 15 i think two maybe but not one.

but keep it going u will get it somewhere i have been doing it for some years now and don't know it all just yet lol

Do you know what standing waves are?

profundus-sanus
01-05-2008, 11:38 AM
you are going to want to put a divider between the two ports. Like a 3 deep inch board right behind the sub standing vertical, to seperate them. I built a box comparable to that and it help with efficiency tremendously.

With that much vb and port area that thing is gonna be a low end monster.

IDSkoT
01-05-2008, 12:34 PM
Hey, I don't mean to try to hijack this thread, but I made one last night. I did the math and such. It's for 2 JBL 10" [They're actually pretty decent subs] 250-Watt RMS subs:

1.25 Ft^3 tune to 40Hz:
(It said for 1 Sub ported it was 1.25Ft^3. Should it be bigger for 2?)

http://img.photobucket.com/albums/v714/TwistedShot/Sub%20Box%20and%20Amp%20Rack/PortedBox.jpg


EDIT:: it ends up being 24682.375 Inch^3 [1.25Ft^3 converted to In^3 is 2160In^3] not including the space taken up by the actual ports.
(I'm new at ports, don't know how to add them up and such)

R/T Pimp
01-05-2008, 12:41 PM
I have found 4.8 at 37 hertz is the best all around on that sub. That box is to big for that kind of power. Port area with the bl on that woofer I would go more like 60 square inches sir. So if anything drop the box size down to 5 cubes and tune no lower then 32.

IgnoreMe
01-05-2008, 06:54 PM
just read the first page i would say by looking at it that u would have a standing wave issue inside the box with that empty cavity space behind the ports. prolly wanna look more into that some and yess 6 cu ft is quite large for one 15 i think two maybe but not one.

but keep it going u will get it somewhere i have been doing it for some years now and don't know it all just yet lol

there will be no standing waves inside the box with sub bass freqs...