PDA

View Full Version : (4) 15" car subwoofer box design?? help? comments??



joe913
07-16-2011, 06:07 AM
so i built my first subwoofer box, well i built it on google sketchup 8. i know its a bit big for my first build but, you know what they say, go big or go home =) i was going to post a video of the google sketchup but it wont let me? so ill try to explain all that i can, the box is custom designed to fit in the back of my 2007 dodge caliber. its going to have (4) 15" subs *not completely sure wich ones yet,just used basically generic numbers to design the box, will change the ports a bit when know for sure wich subwoofers i will be getting* the box is 7.9 cubic feet with (3) 4" diameter ports that are 3 inches long. WINisd says i have it tuned to 40hz. soo umm, not sure what else i can tell you guys. just wondering if this sounds alright. comments or suggestions would be great! thanks =)

RAM_Designs
07-16-2011, 07:33 AM
There's not enough space to properly do four 15's in a Caliber. The box you have planned right now is to small in volume and has way too little port area. A general box for four 15's should be about 14ft^3 after all displacements and have about 150-220in^2 of port area, depending on the overall install. You have 7.9ft^3 and 38in^2 of port.

joe913
07-16-2011, 04:55 PM
i know its not an ideal setting for something like this. but could i still get it to sound good? is there any way to get this to work?

pro-rabbit
07-16-2011, 04:58 PM
i know its not an ideal setting for something like this. but could i still get it to sound good? is there any way to get this to work?

You are far better off building it the right way and using subs in the optimal enclosure rather then an enclosure that is just far to small.

KyleBechtold
07-16-2011, 04:59 PM
7.9 would be 1-2 18's or 15's try some btls

pro-rabbit
07-16-2011, 05:01 PM
7.9 would be 1-2 18's or 15's try some btls

7.9 would be 1 18 only not two...and 2 15s(that like a small enclosure)...could also get 3 12s in there(maybe).

KyleBechtold
07-16-2011, 05:02 PM
7.9 would be 1 18 only not two...and 2 15s...could also get 3 12s in there.

depending on power and sub and what his overall goals are. you can do 2 18s..

pro-rabbit
07-16-2011, 05:04 PM
depending on power and sub and what his overall goals are. you can do 2 18s..

I don't see that. Not for a daily enclosure would just be a waste I could make a couple 8's louder for daily then 2 18s would get in that small of a box haha.

KyleBechtold
07-16-2011, 05:07 PM
like I said.. goals and power.. and I would bet against that.. just saying.. depending on what subs and power of course..

The_Grimy_One
07-16-2011, 05:13 PM
I would tune it lower, maybe around 32-35. And put a new baffle on the front, and cut it for 2 15s. If you get some quality subs and a good amp, should pound pretty hard.

joe913
07-16-2011, 05:21 PM
You are far better off building it the right way and using subs in the optimal enclosure rather then an enclosure that is just far to small.

do you guys think that i could just make it a sealed box? do you think that would sound better then if i changed it around to (2) 15s or something along those lines?

joe913
07-16-2011, 05:23 PM
like I said.. goals and power.. and I would bet against that.. just saying.. depending on what subs and power of course..

in all honesty, my goal is just to blow my friends (2) 15s out of the water. hes got a sealed box and hes running i think about 1000 watts. but it sounds really good. all im looking to do is to get the absolute most bass out of this small area. what do you guys would think be best to do?

KyleBechtold
07-16-2011, 05:30 PM
MOST bass is all you want? 2 15s ported.. on 4kw should do a number lol

joe913
07-16-2011, 05:31 PM
ive got (2) 12" kickers in a sealed box right now. running with a 1000 watt kicker amp. its good for that everyday music kind of bass, but not that OVER THE TOP bass that im looking for haha

KyleBechtold
07-16-2011, 05:35 PM
subs up port back.. unless that 7.9 takes up the entirety of the back space..

joe913
07-16-2011, 05:39 PM
yeaa... that 7.9 is taking up every last inch of my trunk.. lol i have a video i took of the google sketchup plan, but it wont let me post it. its going in my dodge caliber, and the box is basically designed to go with the curves of the back of my car haha

KyleBechtold
07-16-2011, 05:43 PM
oh so you are sealing it forward then.. so subs and port forward.. about 4kw should do the trick

bls
btls
Aqs
Dcs
Sundown
etc etc..

Digital Designs
07-16-2011, 05:43 PM
So you have about 8 cubes NET to work with? If so, I would try to squeeze 4 12s in there. I think that would be your best bet.

pro-rabbit
07-16-2011, 06:01 PM
like I said.. goals and power.. and I would bet against that.. just saying.. depending on what subs and power of course..

blah, endless epen battle is full of fail. I have nothing to prove by telling you other wise you won't listen anyway.




OP-

What are you max dimensions you have to work with?

joe913
07-16-2011, 06:09 PM
i have 7.9 cubic feet to work with, but that 7.9 cubic feet isnt just a normal rectangular box, which makes things a bit more dificult, i have a dodge caliber *hatchback* and the box is slanted at the back to go along with the curve of the window, and so if the back to go along with the curve of the seat. if i wanted to fit a rectangular box in there, i would get much much less volume. =/

joe913
07-16-2011, 07:41 PM
okay, so i changed the sketchup. it now have 2 15" subs, and 7.85 cubic feet, my port is 5" X 5" and is 4 inches long. does this sound any better??

pro-rabbit
07-16-2011, 09:41 PM
email me your sketchup if you can, if it is done with accurate dimensions of course. I can look it over and give you some ideas on how it will work out.

[email protected]

RAM_Designs
07-16-2011, 09:47 PM
You really need more port area...like quadruple the port area. But I have a feeling you won't have enough volume after doing a larger port.

joe913
07-16-2011, 11:40 PM
You really need more port area...like quadruple the port area. But I have a feeling you won't have enough volume after doing a larger port.

i quadrupled it from a 5 x 5 x 4 inch port to a 12 x 10 x 4 inch port? hahah i feel like such, in lack of a better word, noob. haha im just starting to get into all this, and am just now learning everything

joe913
07-16-2011, 11:48 PM
and i have 7.7 cubic feet left... forgot to add that to the last post

joe913
07-16-2011, 11:53 PM
email me your sketchup if you can, if it is done with accurate dimensions of course. I can look it over and give you some ideas on how it will work out.

[email protected]

just sent you the sketchup =p

rosshimself13
07-16-2011, 11:57 PM
you need to lengthen the port as well or you will be tuned ridiculously high.. you cant just change one parameter... take a screen shot or something so that we can see what we are even talking about... i think this is going to be more than you should bite off for a first build, and i think if you had 1 15 with proper electric, enclosure, and of course a good driver you would be louder than you think.. but you may have just enough room to do a single 18 as well...
:imo:

joe913
07-17-2011, 12:05 AM
you need to lengthen the port as well or you will be tuned ridiculously high.. you cant just change one parameter... take a screen shot or something so that we can see what we are even talking about... i think this is going to be more than you should bite off for a first build, and i think if you had 1 15 with proper electric, enclosure, and of course a good driver you would be louder than you think.. but you may have just enough room to do a single 18 as well...
:imo:

heres the pictures of the box. and yea, i know its a bit much for my first build, but i know after i build this i wont be building one for a while, so i thought i might as well just do it how i want it, like i said, go big or go home, haha.

26525938265259392652594026525941

rosshimself13
07-17-2011, 12:26 AM
no!

Your doing it all wrong, if you are going to seal it off have the port and subs face the front. Those dowels would be doing very little, and i am not sure whats going on the the side of the box with the port but it would be very difficult to replicate with MDF for a beginner, and wouldnt be a good idea to have a joint right there in the middle of the box where it will see quite a bit of stress..

you should probably take some accurate measurements of the vehicle and give yourself some room to get it into your vehicle.. that box your looking at loaded with subs would probably be close to 200lbs...

joe913
07-17-2011, 12:41 AM
no!

Your doing it all wrong, if you are going to seal it off have the port and subs face the front. Those dowels would be doing very little, and i am not sure whats going on the the side of the box with the port but it would be very difficult to replicate with MDF for a beginner, and wouldnt be a good idea to have a joint right there in the middle of the box where it will see quite a bit of stress..

you should probably take some accurate measurements of the vehicle and give yourself some room to get it into your vehicle.. that box your looking at loaded with subs would probably be close to 200lbs...

im a beginner at building sub boxes and basically audio equipment in general, not at building in general. i am very good with my hands and have a whole shop setup in my garage. and i have taken accurate measurements, which is why the box is shaped the way it is, the port fits right between the two head rests of the back seat. and i know it has problems, which is why i posted it up here, because im new at this and looking for some help.

joe913
07-17-2011, 01:08 AM
i changed the port, its 24" X 2" X 7" long. i still have 7.55 cubic feet. what do you guys think? better?? worse??

265259422652594326525944