Hello I bought a pair for HD 598 recently new for $170 but haven't opened them yet. I've seen a lot of people praise the Q701 but they say they need a amp to truly enjoy them and that's out of my budget to buy a amp at this time. Question is what's the better headphone amp-less to use with my...

Hi I just bought a brand new pair of HD 598 for $157 was wondering if I made a good purchase I plan to give my dad my old HD 555 will I hear a major upgrade in sound. Also this is my first post/topic :)