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View Full Version : Need a little advise on box design



JBloud47
02-01-2008, 06:38 PM
Im about to finaly get started on my build for my 4 18" SX's. Wanting to get some input on box volume, right now i thinking about going 7.5 cubes per 380 Sq in of port @ 32.

18inchjeepin
02-01-2008, 09:18 PM
1.875 cubers per driver or 7.5 per driver?

JBloud47
02-01-2008, 09:51 PM
thats 7.5 cubes per driver

DarkFox
02-01-2008, 10:01 PM
wow....

JBloud47
02-01-2008, 10:24 PM
input anyone

DarkFox
02-02-2008, 02:08 PM
seems like a little much.... but then again, i have never worked with the sub. What are you going for?

btdickey99
02-02-2008, 02:23 PM
30 cu ft box?

are you planning on walling it off?

DarkFox
02-02-2008, 02:26 PM
think hes gonna put it in the spare tire well

profundus-sanus
02-02-2008, 02:33 PM
need more info about the overall setup.

vehicle? wall or what?

JBloud47
02-02-2008, 10:44 PM
set up is in a explorer, 4 18'' RE SX with a XXX 10000D, its just a daily set up, oh and no it not going to be a wall, but im also using the space where the back seats were.

DarkFox
02-03-2008, 10:19 AM
IMO, for daily driver, make it a wall behind the rear seats. Not much of a daily driver when you turn your Explorer into a 2 seater. Can probably cut down your enclosure size a bit too.

Since your asking advise, I would go with as much room as you can get behind the rear seats and put all the amps and stuff on the back of the box. I think some explorers have larger rear storage then others though and am not sure which one you got. Just my 2 cents. no doubt if you do what your planning it will be loud, just seems like your sending mixed emotions about daily driving and comps.

How much space can you get behinde the seats? I know a system I did in a buddies explorer, we didnt go above the seats and were at like 12 cubes. Depending on what model you got, I can see you get 24cubes +

JBloud47
02-04-2008, 01:26 PM
yeah thats close to the plan, but right now with box deminsions at 50.5wx 19h x 60l im getting right around 33 cubes, and still got about 2 feet till the back gate.

DarkFox
02-04-2008, 11:39 PM
how much total displacement are you factoring for port and woofers?

DarkFox
02-04-2008, 11:43 PM
nevermind, did a rough estimate and it looked like about 2.2, I guess 3 feet is close enough for total displacements, so that 30 @ 32hz looks about right. All rough estimates though

JBloud47
02-05-2008, 06:25 PM
um off the top of my head 6.5 for port, .22 x4 for subs and about .5 for support.

DarkFox
02-05-2008, 11:03 PM
how so much on the port???? with 380 port area, figuring a box that will end up at about 30 cubes, this is what I get.
380area can be had with any combination, wont make a diff, so:
38 X 10, then for the length, the calculator is saying 12.25 using a square slot port

(38 X 10 X 12.25) / 1728 = 2.7

JBloud47
02-06-2008, 12:59 AM
then i think i might have miss calculated something, let me double check the numbers i got,

JBloud47
02-06-2008, 02:15 PM
well i looked at my numbers and this is what i got, these are numebrs for all the diff sizes i might go with.

Aslo I use Win Isd to get the port lenghts. cold be why they are off some.
the 11.5 is for a double thick wall. 10 + 1.5

30 ft^3 @ 30 - 38 x 11.5 x 21.67 = 5.48 ft^3
30 ft^3 @ 32 - 38 x 11.5 x 17.10 = 4.32 ft^3
28 ft^3 @ 30 - 38 x 11.5 x 24.37 = 6.16 ft^3
28 ft^3 @ 32- 38 x 11.5 x 19.47 = 4.93 ft^3

DarkFox
02-06-2008, 04:16 PM
yeah that looks about right, don't forget to subtract the length of the port that is in the front baffle as well. Don't know why there is such a difference in port length. When I go for quick numbers this is what I use:
http://www.carstereo.com/help2/Articles.cfm?id=31
Although, that was clicking slot port. I don't know how much different if factors it, not being a slot but I think it is a little longer.

JBloud47
02-06-2008, 11:41 PM
used that link to check all the numbers they are only off by a couple hundreths of an inch. so shoulc be good, just got to get my batts in so i can get started on this mammoth bastard.