I have a beginner question about how you figure out what your sub enclosure is tuned to?
is this done by looking at the frequency response graph and my the maximum response frequency? or is it at the half power point (I think the variable is called F3)?
I have already built a box that was recommended by the manufacturer, so the defining variables are known already.
Download a free speaker design programme and enter your box volume and a tuning frequency and your port diameter then keep changing the tuning frequency till the programme tells you the port length you need is what you have. Or post your volume and port diameter and length and hope someone else will work it out . Or by transposing the formula....
Lv=[(1.463x100000000xR2)/(Fb2xVb)]-(1.463xR2)
......so you end up with Fb=whatever. If anybody is actually going to do this Lv=port length Fb=tuning frequency Vb=box volume R=port radius R2=radius squared