Design basis for Ariels?

Thanks tomcat.

The Qts of the vifa is 0.33 while that of the jordan is 0.4.

The jordan also has an Fs of 45 while the vifa's is 60. I figure this will increase my transmission line by almost 20" right off the bat. I will have to figure out how to squeeze in this extra length.

Any other considerations when switching these drivers?
The Jordan is 1/2 way between 0.3 & 0.5 at 0.4 so it should work. I don't think you will need to increase the line as much as that because by adding more stuffing the driver sees it as a longer line. You will have to experiment untill you find the optimum fill -though I feel it should work quite well as it is...