What you need to know about speakers is, there are primarily 3 different values of a speaker that you need in order to figure out what
it's resonation point is.
the Fs, Vas, and Qts.
THEN, you gotta know the golden rule of building enclosures..
1 cubic foot = 1728 cubic inches
Many, many different enclosure programs out there.
If you know the parameters of the speaker(s), you can build a killer enclosure.
Also, i've never, EVER heard a ported enclosure sound worth a fuck of guitar.
Bass, maybe... but all the port is doing is increasing the efficiency of the enclosure to
resonate that the specific frequency you've tuned it to.
So, this whole buisness of buying a ported enclosure off the shelf and throwing a pair of 12"s in it is pure HORSE SHIT.
I've built many, many, many enclosures, from sealed, to ported, to bandpass to 4th order isobaric.
You HAVE to know the parameters, or else you're just pissin' in the wind.
Also, if you're putting speakers into an enclosure that's got too much airspace for that type of speaker, you're going
to throw the volume to it and smoke it once that bitch over-extends.
I've done it, I've seen it done, I've done it for fun.
i've smoked more speakers for warranty purposes than most of you have seen.
(try 120v AC into a Rockford Power 12... 60hz hummmmmmmmmmmmmm...... smoke)
Smoked 24 of 'em right in a row to simply send them to Rockford and have them reconed.
BlauBox is a good prog.
There are several others.
Do your research and try it with a little knowledge, you'll get much better results.