I think Marv should measure a pair at this point to really see what it's all about. Here are more details of what I actually heard with the headphone (I tried multiple tracks on my setup to make sure it wasn't just me):

1) The bass sounded like there was a lot of rumble, but the rumbling sounded thin and lifeless... and not like vibrations either. I could "hear" it, but not "feel" it. It almost sounded like something was loose inside. There was not much frequency extension either, as I strained to cop a "feel" in "Murder Style" by Datsik & Prototype... It just couldn't reach that low, or if it did, it didn't have much force so it was practically inaudible for me.

2) Similarly, there was not enough impact, or any at all. On tracks that would otherwise cause headaches like Radiohead's Little By Little (Caribou Remix), I couldn't feel the thump although it was audible, and fairly tight. It sounded overdamped.

3) Low mid was also forcibly absent. I couldn't hear the resonance of the guitar in Eric Clapton's Tears in Heaven. Strings sounded floaty, and a bit ethereal. Similarly, vocals lacked "grunt" and sounded thin. Clapton almost sounded like he hadn't hit puberty yet...

4) 1-4KHz sounded okay-ish, although a bit uneven.

5) 5-7KHz definitely has a peak somewhere. I don't think I'm just imagining it either. The slight shrill that I heard with the stock HE-560 is definitely present here. Clapton's voice in Tears in Heaven was harsh and grainy.

6) Above that it sounded okay, but the weird bass and mid stood out for me.

In contrast, the Enigma sounded more well-integrated IMO. Solid bass, definitely enough low mid (or probably a bit north of neutral), smooth midrange, no shrill, and only very slight tendency to sound sibilant at 7-10KHz, likely because of a peak somewhere that is meant to "sharpen" certain instruments.