He also might mean the stock frequency response of the headphone might sound "undynamic" - they're quite dark, or at least the Aeon RT closed when I looked at the frequency response, I can imagine them lacking quite a bit of "bite & sparkle" based on the stock frequency response - I'm quite certain those doubts wouldn't remain when EQ'd.Compression goes hand in hand with considerable higher 3rd harm. distortion in the lows. DCA is excellent here so there is no need to look for compression because there won't be any. I would chalk the reports up to subjective mumbo jumbo.