This same old arguement. Someone (falsely) makes the claim that cone size is determinate on output ability or low-end response. People argue a while. Then OP brings on specs from lines of subs that shows a lower Fs as sub sizes increase, proof he thinks. Unfortunately he's lost track of the fact that just because for a given line of woofers, the Fs goes lower upon increasing model size, this does not mean cone size is determinate on low-end reponse.
There 15" models of some subs out there that would be put to shame, at say 20hz, by some other 8 or 10" subs of other brands/models out there. Therefore even simple common sense should dictate that while cone area does affect Fs, output/sensitivity, etc, it is NOT the determining factor in these specs.
Usually when these arguements boil down to this point, the OP knows he is wrong and is just grasping an any attempt to, well, not look wrong. Foote is making the incorrect correlation between specs in model lines, and making generic statements about cone size. IIRC Cotjones made the same mistake, which lead to this same arguement, not too long ago. Now here we are again.
The sad part is, on these boards Ive seen, read, participated in, and then finally ignored due to boredom... hundreds of discussions about this very same topic. Yet here comes Foote with his ever-so-basic knowledge of speaker specs to let me and everyone else here know his little secret he's found, that none of us have ever even considered. Wow, the Fs on an IDQ15 is lower than an IDQ10, amazing... we never noticed before! //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif These arguements wouldn't be so bad if it weren't for the ignorant one also being the arrogant one. Cotjones all over again.