Here it is from the KJung Berg Bandwagon leader
CN 'Carbon Neo'. This is Jim's current neo line, and consists of a 112 and 212. Quite different in voicing from the discontinued AE line. They are punchy, mid present, nice round low end, and the same tweeter as the HD line, resulting in a smooth, organic, well integrated, non sizzly tweeter. Amazing cabs.... punchy like the HD 10's, but bigger down low, and WAY lighter. The 'carbon' part of the name comes from the 'carbon patterned tolex', and is meant to communicate 'lightweight, cutting edge.
AE 'Advanced Engineering' Jim's first neo line. Consisted of a 410, a 210, a 112 and a 212. The 410 and the original 'horizontal' AE210 were very 'tight and bright', as was the original AE112... grindy, punchy. The revised AE112b and the revised vertical AE210 had significantly revoiced crossovers that made them much smoother and more relaxed (I feel the AE210v is one of the best sounding cabs Jim has ever produced). The AE212 was VERY big down low (i.e., low end extended), relaxed in the mids, and relatively hi fi up top, so in a way, a bit like the older HT cabs.
Using those descriptions, for my tonal goals I'd like the AE (VERY big down low). CN (punchy mid present) describes my GK NEO cabs... so is that a CN212 negative? No, its just being real about what the design Jim was looking for in the CN line & thats not anywhere near the F212 design goal of more low end.