PDA

View Full Version : Can someone design me a simple box



jdawg90
03-28-2008, 11:39 PM
Needs to be 48 wide, 19 tall, and 20-26 deep witha 80-120 in^2 slot port, tuned around 33-35. Its gonna be for a 18" Q.
I had designed it with the re calculator but searched and saw that its way off... and it comes out really screwed up on subwoofertools.com
thanks a lot

dB-SPL
03-29-2008, 12:02 AM
What's way off about it? Go back to it and enter the following:
Box Width: 48
Box Height: 19
Top Depth: 22
Bottom Depth: 22
Wood Thickness: 0.75
Port Width: 6.5
Port Length: 0

Should land you right in that ballpark..

-Bill-

AudioFonicz
03-29-2008, 12:04 AM
you did something wrong on RE calc.

you got a snap-shot of you numbers on RE?

jdawg90
03-29-2008, 12:16 AM
k i entered it and it looks good but is what i saw some people were concerned about is how the port lengths dont match... it says port length 1 is 14.75 port 2 is 0, but total port length is 25.25!!!???

edit: yea i saw that and fixed it... theres still a 10.5" difference... if u subtract 6.5" theres still5 inches not counted for

dB-SPL
03-29-2008, 12:18 AM
Port length is measured right down the very center of the port. Not the port wall itself.

EDIT: You entered something wrong if your port lengths are 18.25 and 26.X total.

-Bill-

AudioFonicz
03-29-2008, 12:21 AM
why would you wanna make it 0?

jdawg90
03-29-2008, 12:21 AM
but that still does not come out... theres still 5 inches or so unaccounted for, right?

Andrew2006
03-29-2008, 12:24 AM
go here it helped me out alot pretty good program for free
http://www.subwoofertools.com/forum/ported-box.asp

AudioFonicz
03-29-2008, 12:29 AM
its called end factors.

re calc is always within .4 of an inch of winISD.

jdawg90
03-29-2008, 12:33 AM
this is what happens with subwoofertools.com....
http://s209.photobucket.com/albums/bb240/deatron3000/?action=view&current=box.jpg

AudioFonicz
03-29-2008, 12:34 AM
make the enclosure bigger.

dB-SPL
03-29-2008, 12:36 AM
this is what happens with subwoofertools.com....
http://s209.photobucket.com/albums/bb240/deatron3000/?action=view&current=box.jpg

They don't look like the dimensions you were lookin' for.

-Bill-

jdawg
03-29-2008, 12:41 AM
got one

jdawg
03-29-2008, 12:42 AM
change the xmax *******

dB-SPL
03-29-2008, 12:49 AM
On subwoofertools enter 48 x 19, 18" round, 24 Xmax, .23 Cu.ft. displacement, 1 woofer, 8 cubes Net and 34Hz. That should look a bit more like a rectangle. ;)

-Bill-

jdawg
03-29-2008, 12:54 AM
http://www.subwoofertools.com/forum/ported-box.asp?Ew=48&Eh=19&Dia=11&Xmax=27&Vd=.24&NumW=1&Vb=7&Fb=33&Qts=&Vas=&Fs=&CE=0

jdawg90
03-29-2008, 12:55 AM
jdawg, do you think the port is too big for 7 cubes?

what about this one
http://i209.photobucket.com/albums/bb240/deatron3000/box2.jpg?t=1206762884

jdawg
03-29-2008, 01:00 AM
looks fine to me, I would tune lower but thats just me

jdawg90
03-29-2008, 01:03 AM
ok thanks ill change it to like 33

Andrew2006
03-29-2008, 01:06 AM
is there a better program to use?

dB-SPL
03-29-2008, 01:08 AM
What's wrong with the ones mentioned?

-Bill-

jdawg
03-29-2008, 01:10 AM
thats about as basic as you get. RE has a calculator, you can buy stuff and do alot with it. Honestly I do most of mine with pencil, paper and calculator. I am old, I can remember when there was NO internet and we didnt have these easy to use porgrams.
edit- thats the only one I believe that will give you a cut sheet and is free

Andrew2006
03-29-2008, 01:10 AM
i just know that one im new to the box building no hard feelings lol and nothing wrong with them just have not seen many posted

jdawg
03-29-2008, 01:14 AM
http://www.carstereo.com/help/Articles.cfm?Car_Audio=Car%20Audio%20Crossover%20D esign

Andrew2006
03-29-2008, 01:23 AM
thank you

jdawg
03-29-2008, 01:25 AM
no prob