Effective port lenght=tuned at?

[SQBubble 10+ year member]

17.5in of effective port lenght, how do u know whats it tuned at?

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[Beat_Dominator 5,000+ posts]

Need to know the cross-sectional area of the port AND volume of the box.

 

[SQBubble 10+ year member]

Need to know the cross-sectional area of the port AND volume of the box.

wuts cross-sectional aera?

external dimension

width: 27in

height: 17in

depth: 18in

GROSS cubic feet: 4.78

internal dimension and specs

woofer disp.: 0.2

NET cubic feet: 3.10-.2 = 2.9

port size: 62square inch (15.5 x 4)

 

[SQBubble 10+ year member]

its kinda like this

 

[pwnt by pat 10+ year member]

get the plans then build the box?

 

[SQBubble 10+ year member]

its already built..i just wanna know exactly wut its tuned @

 

[keifersracing 10+ year member]

if the port is 17.5 in long you are looking at 41.02hz

 

[SQBubble 10+ year member]

woww, i just did the calculation, it turned out 49hz, is it correct? I used JL's web site's calculation.

http://mobile.jlaudio.com/support_pages.php?page_id=165

and cross-sectional is the port size right?

 

[keifersracing 10+ year member]

i have bass box pro 6

 

[SQBubble 10+ year member]

where could I get this?

 

[PV Audio 5,000+ posts]

You have port width, and port height. Post each, and multiply the numbers. That's the cross-sectional area.

 

[keifersracing 10+ year member]

buy it or get it off of some one and it is not cheap

 

[SQBubble 10+ year member]

You have port width, and port height. Post each, and multiply the numbers. That's the cross-sectional area.

ya then its 62sq.in(15.5x4), so I guess my calculation were good, but can someone just verify it?

 

[keifersracing 10+ year member]

from what i came up with is 41 hz the box is 17hX27wX18d at 62sqin of port at 17.5 long

 

[SQBubble 10+ year member]

from what i came up with is 41 hz the box is 17hX27wX18d at 62sqin of port at 17.5 long

but this is external box size! dont you need the internal NET box size which is 21x16.5x15.5, can u calculate with these numbers just to see the difference plz!