emotiva dxa-1 gen 2 vs dxa dr1 gen 3

i have two XPA-1 GEN 2 to movr my kef blades two and love the result.

need two new monoblocks for different stereo installation (kef referente 3) and wonder if the improvements in the new XPA DR1 compensate for the fact that they cannot operate class A like the Gen 2.

emotiva saysthis the dr1 GEN 3 are "lighter, faster and more efficient" but I have no clue as to what that really means sonically.

appreciate any input

j.