Pre/post echo is purely a function of the mastering process for the record. In cutting the lacquer, there are many tradeoffs that have to be made, and the quest for longer playing time inevitably leads to less land between adjacent grooves, and hence increases the possibility that pre-echo will be heard. Also, I believe that there are subtleties to the process of electroplating the lacquers where experience and skill can determine the amount of pre-echo . . .
And on top of it, it's likely that you may have different amounts of this artifact based on which particular stamper, mother, and lacquer your particular copy of a given record was made from.
And on top of it, it's likely that you may have different amounts of this artifact based on which particular stamper, mother, and lacquer your particular copy of a given record was made from.