tuning Frequency

[da_bOm 10+ year member]

I just recently finsihed building a new box fro my type R's and anyways i was wondering how do i figure out the tuning frequency to port my box to? and what dimensions i shoudl make my port? the box is 3.6 cu ft, any help would be greatly appreciated

Thanks alot

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[da_bOm 10+ year member]

im located in the sunny okanagan.. Kelowna

the box is 36 wide, 29 deep and 5.5 high also i fibreglasses the spare tire which is 26 diameter and 6 deep

thx alot man

 

[da_bOm 10+ year member]

sorry its 3/4'' mdf too and those are the ext dimension

 

[ss3079 5,000+ posts]

im located in the sunny okanagan.. Kelowna
the box is 36 wide, 29 deep and 5.5 high also i fibreglasses the spare tire which is 26 diameter and 6 deep

thx alot man

I'll let Jmac help you with the box ... //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

Just wanted to say I'm in the West Kootenay's, about 3.5 hours from you //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

- Steve

 

[ss3079 5,000+ posts]

Cool, one of the local experts here lives near you (SS3079) ...
Box = 2.19618 ft^3

As for the spare tire well, I need to know the thickness of the fiberglass used ...

Did you use the water method of finding the volume ?

Yeah well guess what, the box is bigger than we thought ... take B and add 5 inches ... I cut it @ 25", and thats what it's supposed to be //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Every little bit of airspace counts //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

- Steve

 

[da_bOm 10+ year member]

here is the calculator used to obtain the volume of my box..

http://www.eatel.net/~amptech/elecdisc/fibrglas.htm

so i need a port tuned to 30hz? how would i be able to figure out what dimensions that is in a square port? also what formulas do you guys use to figure this out i would love to know how its done...?

THanks alot for the help

 

[accord18 10+ year member]

loudspeakers101.com/ventcal1 has a slot port calculator all u have to do is put in the internal cubes then desired tuning frequency the heighth and width of the port and it will tell you how deep to make the port

 

[ss3079 5,000+ posts]

Apparently that calculator is way off ...

But I've yet to find two port length calculators come with the exact same number come out of it.

- Steve