Vent length in subwoofer simulator

[bobo1on1]

Hi,


I simulated an 8th order bandpass enclosure in subwoofer simulator.

I want to use round vents that are 6 cm in diameter, according to my math that is:

6 * 6 * 1/4 * pi = 28,27 cm²

28,27 * 0,15500031 = 4,38 square inch

However when I enter this in subwoofer simulator the huge vent length it calculates can't be correct can it?

I get the same results when I simulate a vented enclosure and compare it to winisd.

Can anyone help? I'm sure I'm doing something wrong.

 

[Notax]

Because, you must put half-diametar (Rv) at Av. In program, it is written Av, but its calculate with Rv (diametar/2).
In this case, Rv is 30 mm or 1.181 inch.
I sugest to work with 2 or 3 tubes with that diametar, for every volume. In the case of 3 tubes, its sqr(3)*Rv=1.732*1.181(inch)=2.046 inch (half-diametar 52 mm)

 

[bobo1on1]

Thanks, that worked

Now this image just to check that my understanding of the 8 th order bandpass is correct:

 

[Notax]

I don"t know is that correct, but I wouldn"t do that. It seems to complicated. Simulation are not exact what you got in real, specialy for something like this. Good luck.