Vent length in subwoofer simulator

bobo1on1 · 27th October 2005, 04:30 PM

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 · 27th October 2005, 05:04 PM

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 · 28th October 2005, 03:20 PM

Thanks, that worked

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

Notax · 28th October 2005, 04:11 PM

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.

27th October 2005, 04:30 PM	#1
bobo1on1 diyAudio Member Join Date: Dec 2003 Location: Tulips, windmills and wooden shoes.	Vent length in subwoofer simulator 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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Vent length question	DAMIC	Multi-Way	4	20th September 2006 05:53 AM
Vent length recalculation formula	arjscott	Multi-Way	3	29th May 2006 11:54 AM
Vent Length	eag	Subwoofers	3	26th February 2006 01:31 AM
new Subwoofer Simulator	f4ier	Subwoofers	4	7th May 2002 06:09 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

27th October 2005, 05:04 PM	#2
Notax diyAudio Member Join Date: Jun 2004 Location: Belgrade	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=1.7321.181(inch)=2.046 inch (half-diametar 52 mm)

28th October 2005, 03:20 PM	#3
bobo1on1 diyAudio Member Join Date: Dec 2003 Location: Tulips, windmills and wooden shoes.	Thanks, that worked Now this image just to check that my understanding of the 8 th order bandpass is correct:

28th October 2005, 04:11 PM	#4
Notax diyAudio Member Join Date: Jun 2004 Location: Belgrade	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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)