View Full Version : how to figure lxwxh of vent to get hz

05-02-2004, 12:00 AM
just as the title says how do you figure this?

05-02-2004, 12:40 AM
http://www.loudspeakers101.com/VentCal1.htm http://www.jlaudio.com/tutorials/ports/index.html either of those will help you

05-02-2004, 12:45 AM
thank you that helps alot

05-02-2004, 06:47 PM
Quick question,

When it aks for the box volume, then the desired tuning frequency...are you supposed to enter the size that you want the box to be AFTER vent displacement?......

..And then when it tells you the length your slot port needs to be, do you then figure up how much space the vent will take up, then add that to the size box you wanted b4 vent displacement to = the total internal volume your box needs to be?

BTW, this is for the first link.

05-03-2004, 02:31 AM
Anything that takes up space within the enclosure must be taken into account ... Ports, braces, drivers, etc.

Also, I don't trust the loudspeakers101 calculator. Use WinISD Pro, JL Audio's formula, or diysubwoofers.org's formula ...

and all three provide consistantly different answers....c'est la vie!

the only way to make sure you get it right is to do the formula on the JL website...and do it more than once. MEASURE TWICE, CUT ONCE!