I don't know those headphones, but Grados are supposed to be excellent at their price points. They might be just revealing the flaws in your amp & CDP--sometimes happens when you upgrade one component.....
*do i really have to buy a $500 cdp and headphone amp to get good sound out of $70 headphones?*
*do i really have to buy a $500 cdp and headphone amp to get good sound out of $70 headphones?*