Its like the effect of ATRAC on Mini Disc, frequencies and info felt by the process that are not heard are discarded in the recording, but this process is audible and presents a drop in quality. In reverse sound we are not supposed to be able to hear still has an impact on us and this where super tweeters come in..... at least that is what the theory says.

Not had an opportunity to try an add on super tweeter, but my Anthony Gallo Reference 3s tweeter is a super tweeter.