I am replacing my listening room with something I can enjoy anywhere in the house.  My headphone choice is between the Grado 225i or the AT ATH-AD900.  I would like to run my MP3 player through a better amp/dac (considering the Fiio E10), but am not sure I understand how they work.   1.  If...

I am new to this forum, and I would like your advice.  If I could buy either of these at the same price, comfort or build not considered, purely based on sound, which do you think is better?    I listen to everything except rap/hip-hop/electonica/dance so exagerated or highlighted bass is...