I'm wondering the same thing. Paired with a ZO2, they'd probably have been a better option than the XB700 since they actually...sound okay with everything else. I'm not an XB fan; the XB500 sounds horrendous for most things other than electronic (though I've been told EQ fixes that?) and the XB700 was kind of underwhelming in terms of actual thump when unamped. Not to say they lacked bass, but I expected more. They were about even with the Beats Pro.