Hello There, I am looking at purchasing a pair of IEM's to use when travelling, especially flying. I prefer to have headphones with a flat frequency response, so I hear as close to possible, the audio the way it was recorded. What IEM has the flattest frequency response curve? or...

Hi, I have ordered a pair of hd650's. I will listen to them from a laptop headphone out. If I purchase a headphone amp, does science predict any sound quality improvement? Thanks, Sean.