Thanks for the links although it is in German but the principle remains the same, the good thing with my soft ware isit is very simple to use it will design from the simplest sealed box to even more complex isobaric 4th thru 7th order boxes with great result and sound quality and it does save time and fraustration and wasting materials from trial and error.
From working on the Fiero design I tried a sealed box ( like the substation) and it did sound good but had a tendancy to sound a little hollow at high volume while in the lower frequency range, so it was redesigned like the legendary bazookas tubes and it sounded much better with less applied power than before so distortion is kept to a minimum and the speaker cone has controlled travel motion protecting the spider and voice coil from going off axis .
It is time consuming to make them and the price I offer is good for the patience involved so we'll see how it turns out and I will make them as per request instead of mass producing and having them sit .
[This message has been edited by gunslinger (edited 11-18-2008).]