I have to remind you, my friend, it's only "semi-opened." That's probably why not such a wide soundstage. Then again, the M200 is not opened at all and has a wide soundstage (although I think there's a greater distance between the micro-driver (handling the highs and mids) and the bass driver.
yeppp is aware of that but it has more to do with their airiness of the presentation. The Zero Audio Bassos despite it's "closed" design has a lot more air in it's sound with a larger soundstage as well, but i guess when the stage is too wide/ too airy the over all presentation MIGHT become less coherent/ cohesive which makes for a messy sound. This was the problem some people had with the Brainwavz R1s me thinks.