Just now reading your RTA summary. I have no problem hearing differences above 13kHz in my system. I have some pretty nice amps and speakers (although no guarantee it makes a big difference). The default 18kHz band is only noticable with large EQ deviations and a track with a lot of high hats, etc. Although Your effort to share results is greatly appreciated.

Cory
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MK2a 160GB

11 Years later, these Mk2a units still rock...