Note on the reviewer. I have a critical ear and enough musical performance experience to know what voices and instruments _should_ sound like. I am not an experienced audio reviewer though, so just assume I'm a noob. This review focus primarily on sound (how it performs and what I was looking for), and some unfortunate build issues. No unboxing pictures here. Search Criteria / Story This is my story of looking for an upgrade from my SONY MDR-7506 headphones that I have been using with my FiiO M11 DAP. I also have some AKG K501's, but the DAP...