That is for the Infinity Primus p360, but as far as I know the p360 and p363 are the same except for cosmetics. I wouldn't be surprised is the cause of the change was different measurement technique. However in either measurement, the Primus speaker is very flat except for bass a tad hot. Anyway I don't think opera vocals should be recessed with these speakers. Unless the OP is used to elevated mids. I think it is a setup issue.