reason is that you have to buy a few for several different drivers. will have to purchase both ss and ds enclosures as well. then a legitmate analysis can be made. well actually, even then it will be quite difficult because figuring out what concepts the enclosure uses to function will be a trying task. when i model up my own version of a "fake shell" using some dbr, transmission line and some other unique design concepts //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif it models up rather close to that of tuan's model. just a few differences which may have an affect on the entire design. hmm come to think of it, need to calcuate to see if john nolte's adjustable sliding board concept adheres to tuan's model. all in all, lots of controversy with john's design in all ways and back around. //content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif