Further, I did some tone analysis of samples of bass guitar sent to me by a fellow here. We found that for all of them, the 2nd harmonic (f x 2) was stronger than the fundamental (f).As far as this bass spkr project
http://www.geocities.com/SunsetStrip/Bistro/3491/speaker.html
the model number he quotes for the 15" woofer is no longer valid. I ran the numbers and in that cab you can also use the Eminence Delta-15, Delta Pro-15, Gamma-15.
For the 2x12 cab by the same author
http://www.geocities.com/SunsetStrip/Bistro/3491/speaker2.html
You can use Eminence Delta-12's.