Quote Originally Posted by GM View Post
Easy, I used well-proven math for vented alignments, not the formula for a heavily stuffed sealed alignment as this calculator does.

Yes, I’m familiar with it; the basslist threads I was usually a part of prompted many of his tech topics. For the record though, his generalizations are just that, a ‘vents for dummies’ tutorial since at the time few of us on the forums that understood most/all of the ramifications didn’t want to part with our hard won knowledge just so folks could go off and use it for profit.

Anyway, if anyone is serious about DIY speaker design as a hobby or business, I strongly recommend you use MJK’s MathCad software [please pay the business fee if applicable] as it’s the most accurate I’ve ever used and not nearly as hard to learn in depth as AkAbak.

FWIW, the math I’ve used for decades to calculate vents match right up with his calculations when a lightly damped golden or acoustic ratio cab is simmed and his MLTL vent calculations line up with the measured results of some of my old designs I still had final details of, so confident enough that any other alignments would be too, though if I needed it to be tuned to Fs I would cut the vent[s] too long and do the measurements to fine tune it.

GM
I love how you force us to learn, it kinda feels like your a professor and were your pupils. It truly is a good feeling and as my dad used to say nothing worth earning is free. I have the winIsd at home on my puter so I'll fire it up and see if I can remember from the last time I tried using it. As always Thanks Greg.