Thanks - I've been looking at a few of the pdfs that came with the cab packs but have not found much related info.
I was auditioning class-A cabs and expected a 57-A to be brighter than a 57-C thinking that a "C" must mean "farther out on the cone toward the edge of the speaker", but I was hearing the opposite. So after this it's just "pick what you like the sound of" and your into the rabbit hole wince there's too many to audition in that manner.
For me I really need a logical way to choose from a large selection of IR files (ir brand, cab type/size, speaker type, mic type, mic placement in relation to cab (front/rear/off-axis), mic placement in relation to speaker cap, mic distance. If I don't have my head around what each IR files means in relation to these parameters in a big IR library to aid in selection then I find myself just aimlessly swimming in an ocean of IRs. At some point I imagine having a graphical interface where we choose a cabinet, speaker type, and mic typ and then move it around on the screen while the software picks the related IR behind the scene (I think BIAS has kinda done this with Celestion but not sure it would be possible across different IR suppliers).