I definitely do not want you to freak out! The LCD-X are indeed excellent but they do have less sub-bass presence than what the LCD-3 offers. The only other can that offers similar sub-bass and impact is the Fostex TH900. From my experience, quality sub-bass is the secret ingredient that allows you to rock out with headphones. For pop, the LCD-X is great and very detailed. It will also be very interesting to read your comparison on the HE500 vs LCD-X.