15-inchers

Can anyone describe the tone of the two 15" American Vintage speakers in terms of which 12" speaker they would be closer to? Also can these speakers be made in a 4ohm version?

Well, the G12 would be the easy answer, of course  ... only with a little bigger tone, a more extended bottom end and a "rounder" tone.  Personally, I like the G15 best in a medium sized open-back combo ... ala tweed Pro.