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mustangowner
05-11-2005, 01:41 PM
did the best I could on designing this box. Its for my 2 alpine 10' type r's. I am gonna make a single chamber with one slotted port.

box specs:
Height--10" (will work)
width--31"
depth--24"

Port specs:
Tuning to 32 hertz
width--4"
height--8 1/2"
length--20.59"

box will be 3.265 ^3 total
-port (.459^3)=2.806^3
-sub displacement (.115 per sub=.23)=2.576^3
-bracing (.076)=2.5^3 which is 1.25^3 per sub according to manf. specs.

please look over this and let me know of any mistakes i might have made.

mustangowner
05-11-2005, 04:41 PM
could someone please double check this for me. :)

bcarpenterfhl
05-11-2005, 07:39 PM
your volume was calculated perfectly, displacements and everything. however, the tuning wasnt. the box is tuned closer to 38 Hz.

mustangowner
05-12-2005, 06:52 AM
what would i have to do to get the tuning down? make the port less than 4 inches wide?

jellyfish420
05-12-2005, 08:44 AM
you didn't believe me.....

mustangowner
05-12-2005, 10:09 AM
you never gave me an answer to believe. so I did it myself...to the best of my knowledge.

so what do i need to do to get 32 hertz?

jellyfish420
05-12-2005, 03:20 PM
you never gave me an answer to believe. so I did it myself...to the best of my knowledge.

so what do i need to do to get 32 hertz?
hmmmm.... thats odd! i checked my sent box, and there is nothing, and you say you have nothing......but i distinctly remember yesterday writing you back and saying it was around 37Hz. i sat down and figured it out w/ pen and paper yesterday, right after you pm'd me. man my server has been ******* up alot lately!

mustangowner
05-12-2005, 04:30 PM
never got anything. so what do i need to do to tune it down some?

bcarpenterfhl
05-12-2005, 05:04 PM
you could do many things such as decrease the port area, increase the port length, increase the volume, or a combination of any of them.

Decipha
05-13-2005, 04:54 AM
make the port length about 28" but that will mess with your net volume for your subs

mustangowner
05-13-2005, 11:40 AM
checked and rechecked and i still get this same design. it comes out the same everytime. Checked with WinISD and used... www.carstereo.com/help/Articles.cfm
to help with calculations. Here is a drawing of the box i plan to build...

bcarpenterfhl
05-13-2005, 11:52 AM
http://www.rockymountainfun.com/amp/portcalc.xls

use that. u need excell to run it.

mustangowner
05-13-2005, 03:21 PM
got another question...when someone says length of the port, does this mean length down the center of the port or along the side of the port? cause that can make a big difference.

mustangowner
05-14-2005, 10:09 AM
bump

Fiesta_si
05-15-2005, 05:35 PM
It means the center line down the middle of the port i.e. if the port is 2 inches from the side wall you would measure the port length 1 inch from the side wall - the center line.

Mike

mustangowner
05-16-2005, 07:03 AM
ok thanks