I recently received a pair of DT 990 pros (250 Ohms) as a gift from my grandmother and I am brand new to this sort of technology. Practically all I've ever owned in the sound department were different iPod headphones. The headphones sound great. Much better than I am used to but I am unsure if it's worth spending money of a headphone amp and DAC. All I have to play my music on is my laptop which is quite old and is beginning to fall apart or my nokia lumia 800 which is already really quiet. I listen mainly to progressive rock like Yes and Van der Graaf Generator (dunno if that helps) and I have around $300 to spend if the difference is worth it.