Additionally, note that the Ether C requires up to 200 hours of burn-in to achieve its maximum sound quality -- especially in the bass. The manufacturer has stated this on the Head-Fi site and there are numerous posts by owners attesting to this. This is because the pleats in the planar ribbon drivers need more time to flex to achieve their designed specs.
When new without break-in, the sound is constrained with light bass. Don't worry, as they burn in the sound continues to improve until the 200 hour mark or so, when the sound is superb.
Also, strangely enough, the soundstage on the Ether C, a closed headphone, is larger than in the LCD-X, an open headphone.