I believe there was some review around where a guy flew in Axiom to blindly listen to speakers which he found out were the V3s compared to V2s of the M80...he said he couldn't tell a difference. I think the consensus is there isn't any extremely audible differences between V2s and 3s.
I don't think what you are referring to was a blind test of the V2 vs V3 but that of the stock M80 crossover which is used in the m80 vs a modified m80 crossover using air core inductors. It was published around the V2 to V3 transition.
