Hi there, i just bought my first iem which is Grado iGI secondhand. The problem is the sound is quite muddy and very different from Grado iGE which is a surprise to me. Do I need to burn in it first or does the sound of iGI is really like that? 

Halo guys, im new in this kind of audio thing. I just bought Audio technica ATH SJ-33. I want to pair it with a portable headphone amp for a better sound. My budget is around 20$-30$. I have an interest on Fiio E6 because the review, but i dont know will it suit my SJ33.