47 x 47 x 21 How big a box can i make

 

Gold Member
Username: Killerzracing71

Post Number: 2132
Registered: Aug-05
I want 4 18s tuned to 28hz

Help me PLZ lol

can i do 47 x47 x 18 and fire sub up port back
 

Gold Member
Username: Nyyfan13

15 MAG USA

Post Number: 9406
Registered: Jul-06
I got about 23.5cuft with those dimensions.....obviously does not include port or driver displacement. Just how many cuft you have there.
 

Gold Member
Username: Frkkevin

Resonant Engineering..., Fort Worth... Email

Post Number: 4960
Registered: Nov-05
close to enough.. should be fine
 

Platinum Member
Username: Wingmanalive

A pic is worth 1000 posts!!

Post Number: 16260
Registered: Jun-06
"I want 4 18s tuned to 28hz"



I hope you have a moving van lol.
 

Gold Member
Username: Killerzracing71

Post Number: 2133
Registered: Aug-05
Naw 92 caprice Wagon FTW
LOL
 

Gold Member
Username: •cam•

BC Canada

Post Number: 2443
Registered: Nov-06
I got 19.77. I assumed his dims were external though.
 

Platinum Member
Username: Rovin

1 15 = 149.1DBsTrinidad & T...

Post Number: 13631
Registered: Jul-05
using 3\4 ndf as external i got 23.36cuft

divide that by 4 sub = 5.84cuft

after port & sub disp ur going to lose alot - can run 4 15s but in a compact box

if were me id do 2 18s tuned around 33hz in that space for some nice insane sql ....
 

Gold Member
Username: •cam•

BC Canada

Post Number: 2444
Registered: Nov-06
"Thread: 47 x 47 x 21 How big a box can i make"


"can i do 47 x47 x 18 and fire sub up port back"

I used the second dimensions.
(45.5*45.5*16.5)
 

Gold Member
Username: Killerzracing71

Post Number: 2134
Registered: Aug-05
http://www.subwoofertools.com/forum/ported-box.asp?Ew=47&Eh=19&Dia=11&Xmax=13&Vd =.1&NumW=3&Vb=18&Fb=28&Qts=&Vas=&Fs=&CE=0

did this and i belive i can do that
 

Gold Member
Username: •cam•

BC Canada

Post Number: 2445
Registered: Nov-06
Don't forget to brace that sucker. How much power do you have?
 

Silver Member
Username: Prozack52

Cincinnati, 2-D615D4 Dia...

Post Number: 305
Registered: Feb-08
are you doin 4 18 or 3 cause that link you have shows you doin 3 woofers
 

Silver Member
Username: Kingtutus

Lincoln, Nebraska U.s.a

Post Number: 262
Registered: Dec-07
that is the max u can do on subwoofertools
 

Gold Member
Username: Tejcurrent

Post Number: 1298
Registered: Apr-07
Assuming only double baffling the top for the subs that would make the box
22.464
(45.5x45.5x18.75==22.464ft)
The subs will displace at least 1ft
21.464
To get enough port with a square port 20x11 at 29" deep would be good, tuning around 28hz and displacing 4.394ft, ending up with around
17.07 ft net.

This may be off just slightly, but with that much space I wouldn't do more than 3 18s or 4 15s.

I just clicked on that link from subwoofer tools, and that box wouldn't have enough port area imo. I'd make sure you had at least 200sq of port.

If you want to do a slot port with the same box I mentioned make the port around 23 inches deep instead. I think it would displace around 3.253ft, so you'd have about 18.211ft net.

That doesn't include bracing, but threaded rod wouldn't displace a whole lot.
 

Silver Member
Username: Surferdude9371

Im BTL Bumpin

Post Number: 865
Registered: Mar-07
im pretty sure your 18s will have an xmax larger than 13.....
 

Gold Member
Username: Killerzracing71

Post Number: 2135
Registered: Aug-05
http://mach5audio.com/zen/index.php?main_page=product_info&cPath=66&products_id= 182

Unfortunetly it has only 12MM of XMAX LOL

and these are cheap 18s man tired of spending 300 ea on a sub LOL

I have a T1000BD ~1300rms if

400$ total shipped to my house

Had the about the same curve on win isd 2 Q 18s but doesnt have a fall off like the Qs after 40hz

Im not ballin like YOu guys LOL
 

Gold Member
Username: Tejcurrent

Post Number: 1302
Registered: Apr-07
Don't trust win isd, it graphs everything wrong imo. I'd only use it for port length and that sort of thing. I've talked to someone (I want to say Scott from Fi, but I don't intend to quote him or say it for sure) that said the BTL graphed better sealed than ported in winisd, which is obviously wrong.
 

Gold Member
Username: Killerzracing71

Post Number: 2136
Registered: Aug-05
:-( darn well i just talked a guy that has 3 in his truck did 147 of 1k rms

i like those numbers
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