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Zeph
10-30-2004, 12:09 PM
I just finished making a program for port tuning calculating, ive used jl audio's formula and im pretty sure its accurate, give it a test and lemme know how it is. ive compared it to a couple hand-done calcs and it gives same answer.

http://mikekd0.tripod.com/id10.html

Simos
11-01-2004, 09:10 AM
I did one too a while back in Excel. See the attached file. As far as I can tell mine is right on. You can check yours against it if youd like.

Simos
11-01-2004, 09:12 AM
Should be fairly self explanatory. You can figure your volume, tuning frequency, and port length if you know the other variables.

Zeph
11-01-2004, 09:33 AM
well, i had the pgrm, input the av,vb, and fb. calculate them using jl audio's formula, then just output the req length.. rather easy, i did it in 2 minutes..

Moe Lester
11-01-2004, 04:30 PM
I wrote a port length calculator program on my TI-83+ :)

Nikuk
11-01-2004, 04:56 PM
Okay, no offense to anyone, but why do so many folks feel the need to re-write the same shite? Math is math. Math is just about the only surely constant thing in life... ?

[/rant]

Scarenius
11-01-2004, 05:42 PM
Zeph, that's some elite C skills right there.

Moe Lester
11-01-2004, 05:49 PM
Program: Tuning

: Input "Freq: ",F
: Input "Area: ",A
: Input "Volume: ",V
:
: (((.025251*A*(1.84*10^8)/(V*F^2))-(.823squarerootsignhere(A))STObuttonL
:
: ClrHome
: Disp L

ill see if i can find my TI83+ software and cable, then ill upload it if i find the stuff.

plazman
11-01-2004, 05:54 PM
question... whats the cross sectional port area ? depth of the box?

this program will calculate the "L" part of the port correct?

Moe Lester
11-01-2004, 05:57 PM
desired tuning frequency is F, type in the frequency you want
the area is A, if your port is 45 square inches, you would enter 45
Volume is box volume in cubic inches. You can type in 2*1728 for a 2 cube box if you dont wanna calculate it and it will still come out correct.


it calculates L, which is port length needed for the tuning frequency, area, and volume you specified before.

plazman
11-01-2004, 06:27 PM
but how would you know if you wanted to make it 3inches wide or 4?

lets say you have a box 3/4 mdf all around.

depth of the box 15 inches (internal) would that mean the cross sectional port would be 13? assuming you are leaving 3 inches for port width?

Zeph
11-02-2004, 05:01 PM
Okay, no offense to anyone, but why do so many folks feel the need to re-write the same shite? Math is math. Math is just about the only surely constant thing in life... ?

[/rant]

re-write? i was excited i got a program that didnt come up with fked up on the length, who **** in your cornflakes? Go talk **** on someone elses thread..

tRiGgEr
11-02-2004, 05:06 PM
or just go here

http://www.carstereo.com/help2/Articles.cfm?id=31

plazman
11-03-2004, 07:26 PM
how come im coming up with different numbers for the length when i use this calculator and carstereo

Moe Lester
11-03-2004, 08:17 PM
carstereo will factor in port end correction for slot ports