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Box tuning

 

Hello Son
Unregistered guest
can somebody tell me what the tuning and internal volume of this box is? I'm looking for about 3.5cu at 32hz

external dimensions (3/4 mdf)
36x20.25x16.5

exact port dimension are
4x15 and it is 31" long

it is for a 15"
 

Bronze Member
Username: Mxl16

Post Number: 22
Registered: Apr-05
http://www.the12volt.com/caraudio/boxcalcs.asp
 

Hello Son
Unregistered guest
i do not see a slot port calc on that page, only a round port
 

Bronze Member
Username: Rayb_satx

Post Number: 22
Registered: Jul-05
what exactly is box tuning?? i see it all the time....but never understood what it means for example "box tuned to 35hz"
 

Hello Son
Unregistered guest
okay, well i've been playing around with the numbers.. is there anything else I need to pay attention to when creating the box? or can I simply "play" with the numbers until i find the right internal volume and port length for the tuning frequency i want?
 

Silver Member
Username: Rovin

Trinidad & T...

Post Number: 190
Registered: Jul-05
Play with the nos (but keeping the internal volume constant) until u find it will fit in your car's space but use the manu rec freq that your sub came .

Ray - read up & get your answers from
www.the12volt.com
www.bcae1.com
www.crutchfield.com

Tutorial & faq sections .
 

Hello Son
Unregistered guest
is there a good calculator online? i've been using http://www.carstereo.com/help/Articles.cfm?id=31

when i enter the volume, that is the total minus the port volume right?? so in order to keep the internal volume constant, i must increase/decrease external demensions according to the port area?
 

Hello Son
Unregistered guest
bump
 

Silver Member
Username: Basshead86

Ocala, FL USA

Post Number: 730
Registered: Aug-05
to calculate internal box volume, you must deduct whatever the thickness of your mdf, or whatever you are using, off of each dimension

for example of you are using 3/4" mdf, you would subtract 1-1/2" of of each measurement.

then you multiply all of those measurements together and divide by 1728, b/c that is the total # of inches in a square foot.

your box's internal volume is: 34-1/2" x 18-3/4" x 15"

your box's internal volume is 5.615ft3

you might have already known that, but you also have to take into consideration the displacement of your sub in the box.

hope this helps in your calculations:-)
 

Silver Member
Username: Basshead86

Ocala, FL USA

Post Number: 731
Registered: Aug-05
1728, b/c that is the total # of inches in a square foot.

*that is the # of inches in a cubed foot*

12 x 12 x 12 = 1,728
 

Hello Son
Unregistered guest
muddy, thanks

but when i endter that in a calculator, such as
http://www.carstereo.com/help/Articles.cfm?id=31

do i enter the 5.615 or 5.615 minus the port area?

also, how do you do length when it's an L shaped vent inside the box
 

Silver Member
Username: Basshead86

Ocala, FL USA

Post Number: 732
Registered: Aug-05
i plugged in some #'s on that website and i think the 5.615ft3 box is tuned to 27hz.

i put the correct width and height measurements in the port calculator (4" x 15"), and then played with the # of hz until i got around 31" deep.
 

Hello Son
Unregistered guest
so when I enter the volume on that calculator, it's the TOTAL volume of the box (volume of the port included
 

Silver Member
Username: Basshead86

Ocala, FL USA

Post Number: 737
Registered: Aug-05
yeah, i think so. lol, but i wouldn't write it in stone if you know what i mean.
 

Hello Son
Unregistered guest
GLASS- help :-)
 

Hello Son
Unregistered guest
bump
 

Hello Son
Unregistered guest
bump
 

Gold Member
Username: Glasswolf

Wisteria, Lane USA

Post Number: 9695
Registered: Dec-03
hmm? with what? I haven't sued that site's calculator. if it asks for gross volume, that's before sub and port displacement.
net volume would be after adding in driver disp and port vol.
 

Bronze Member
Username: Cbrannam

Mount zion, Il Usa

Post Number: 22
Registered: Aug-05
the total volume of the box with the deminsions that you have are 5.639 cu.ft. @ 28.84hz

is that what you were looking for?
 

Hello Son
Unregistered guest
yea man, thanks... I guess that box wont work. I need 3.5cu.ft at 32hz
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