View Full Version : Need a single sealed box design/plan/cutsheet

xDATx

12-04-2009, 05:50 PM

For Rockford Fosgate Punch HX2 RFD2212

I have attached the PDF manual for the specs

If anyone can help I would greatly appreciate it.

thanks

Dan

dr_peeb

12-04-2009, 05:55 PM

For Rockford Fosgate Punch HX2 RFD2212

I have attached the PDF manual for the specs

If anyone can help I would greatly appreciate it.

thanks

Dan

For a sealed box just determine the max space you have to fit the box, and adjust from there using this formula:

L x W x H (all in inches) = cubic inches. Divide that by 1,728 to convert it to cubic feet.

Adjust the dimensions until you get the volume you want/ need.

xDATx

12-04-2009, 06:05 PM

So if i want to get 1.50 Cu Ft what would be an example in dimensions?

ciaonzo

12-04-2009, 06:07 PM

So if i want to get 1.50 Cu Ft what would be an example in dimensions?

C'mon, man. Give it a try, he just gave you all the numbers you need to start plugging away with a calculator.

xDATx

12-04-2009, 06:15 PM

ok so 14" x 14" x 14" = 2744 divided by 1728 = 1.58 Cu Ft ?

ciaonzo

12-04-2009, 06:19 PM

ok so 14" x 14" x 14" = 2744 divided by 1728 = 1.58 Cu Ft ?

You got it. ;)

Don't forget to take into account the displacement of the other items in the enclosure that detract from the gross volume.

xDATx

12-04-2009, 06:21 PM

huh? lol so if i use 3/4 MDF i have to count for that? now i'm confused.

ciaonzo

12-04-2009, 06:26 PM

huh? lol so if i use 3/4 MDF i have to count for that? now i'm confused.

Things like drivers and braces will subtract from your initial volume leaving you with a net volume that may be less than your target volume. You should be using inside dimensions for figuring volume so you don't need to account for the material thickness unless it's an internal brace.

xDATx

12-04-2009, 06:32 PM

ok so if my speaker dis. cu ft. is 0.069 I subtract that from 1.58 Cu Ft leaving me with 1.51 Cu ft?

ciaonzo

12-04-2009, 06:33 PM

ok so if my speaker dis. cu ft. is 0.069 I subtract that from 1.58 Cu Ft leaving me with 1.51 Cu ft?

Yep. :)

xDATx

12-04-2009, 06:35 PM

thanks for walking me through this I was a bit rusty...lol

ciaonzo

12-04-2009, 06:38 PM

thanks for walking me through this I was a bit rusty...lol

No problem. There's lots more involved but at least now you know how to arrive at a required volume.

DNick454

12-04-2009, 06:43 PM

Don't forget, if your BOX's dimensions are 14" X 14" X 14", then the INTERNAL dimensions are actually 12.5x12.5x12.5 because of the 1.5" you have to subtract the width of the two pieces of MDF from each dimension.

ciaonzo

12-04-2009, 06:47 PM

Don't forget, if your BOX's dimensions are 14" X 14" X 14", then the INTERNAL dimensions are actually 12.5x12.5x12.5 because of the 1.5" you have to subtract the width of the two pieces of MDF from each dimension.

Things like drivers and braces will subtract from your initial volume leaving you with a net volume that may be less than your target volume. You should be using inside dimensions for figuring volume so you don't need to account for the material thickness unless it's an internal brace.

:)

dr_peeb

12-04-2009, 07:33 PM

To be clear ... A 14" x 14" x 14" box made from 3/4" think MDF measures only 12.5" x 12.5" x 12.5" on the inside. So, while the outside volume of the box is 2,744 cu in (1.58 cu ft), the inside volume is only 1,953 cu in (1.13 cu ft)

From that #, then subtract out all other solid object(s) that will be in the box, including the sub itself, and any internal braces. The same MDF makes for good internal bracing. The # you're left with is your net volume. You need to adjust the box's overall dimensions until you get the correct net volume you need.

Immociide

12-04-2009, 07:44 PM

3/4 MDF is .75 inch so 13.25" x 13.25" x 13.25

You can do it that way or take the easy way and use a calculator that will factor in the wood thickness for you like the ones on this site.

http://www.bcae1.com/spboxnew2.htm

The site is actually very informative....

ciaonzo

12-04-2009, 07:49 PM

lol

DNick454

12-04-2009, 07:58 PM

3/4 MDF is .75 inch so 13.25" x 13.25" x 13.25

You can do it that way or take the easy way and use a calculator that will factor in the wood thickness for you like the ones on this site.

http://www.bcae1.com/spboxnew2.htm

The site is actually very informative....

I didn't know you only put up ONE wall on each axis? Kinda leaves you with an unsealed box. Top and bottom of box (3/4 + 3/4 = 1.5") Same can be said for the front and back and sides. The internal volume is 1.5" less than outside because there are TWO pieces of MDF (one on each side?)

Elementary math > you

dr_peeb

12-04-2009, 08:13 PM

Poor math skills, Juggalo. Or poor visualization. Or ... somethin' anyway.

Immociide

12-06-2009, 03:18 PM

mostly bad visualization :crap: Im the type who cant visualize things in my head very well. The only way I can is when i have everything either written down or laid out in front of me. Anyways that is why i use that site ;)

supermaxx123

12-06-2009, 03:28 PM

to get an exact 1.25 sealed. inside would be 13 1/4 x 13 1/4 x 13.

Outside would be any which way 14 3/4x 14 3/4x 14 1/2

Thats is no braces inside, I would double baffle the front but add it on the outside.