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Whats my box tuned to?

 

Silver Member
Username: Terry6405

Sullivan, IN US

Post Number: 235
Registered: Sep-05
ok, i build my box totally guessing on the tunning. its a dual 12 hatchback divided in the middle with independent ports. it is
34" wide
16" high
16" deep on top
20" deep on bottom

and the ports are (inside measurements)
1.5" wide
14.5" tall (highth of the box minus the top and bottom)
and the port is 3" from the back of the box (so 13" on top and 17" on the bottom)

all 3/4 MDF

it doesnt sound box with my vmaxes but i just want to know with its tuned to

any idea?
 

Silver Member
Username: Terry6405

Sullivan, IN US

Post Number: 236
Registered: Sep-05
bump
 

Gold Member
Username: Southernrebel

Monroe, Louisiana USA

Post Number: 2087
Registered: Mar-04
how long is the center line of your port? (port lenght?)
 

Silver Member
Username: Terry6405

Sullivan, IN US

Post Number: 243
Registered: Sep-05
i belive around 15"
 

Gold Member
Username: Southernrebel

Monroe, Louisiana USA

Post Number: 2088
Registered: Mar-04
if you port is 15" long...that box is tuned to roughly 43hz.

per chamber you have:
21.75 sq inches of port
1.75cuft (net) air space
tuned to ~43hz (if the port is 15" long)



 

Silver Member
Username: Nocc1n

US

Post Number: 182
Registered: May-05
how do you figure that out, i wanna know hwo to figure out that stuff so i can make my own box
 

Silver Member
Username: Terry6405

Sullivan, IN US

Post Number: 254
Registered: Sep-05
that souns about right because the memphis box i modeled it after is 42, but yea how did you fiure that up for future boxes
 

Bronze Member
Username: Goose5714

Post Number: 41
Registered: Feb-06
the12volt.com has a lot of converors that might help with that (i personally don't know how he came up with that)
 

Gold Member
Username: Southernrebel

Monroe, Louisiana USA

Post Number: 2090
Registered: Mar-04
here is an only box calculator:

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

scroll down about 1/4 of the way to the ported box calculator.

better yet, download WinISD:

http://www.linearteam.dk/default.aspx?pageid=winisdpro
 

Silver Member
Username: Nocc1n

US

Post Number: 183
Registered: May-05
i know how to calculate box sizes and all that, but i wanna know how to calculate slot ports and what they are tuned to
 

Bronze Member
Username: Teddy21

Ann Arbor, MI USA

Post Number: 21
Registered: Feb-06
go here

http://www.carstereo.com/help/Articles.cfm?id=31
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