Well my roxannes came in the mail yesterday and boy are they HUGE! Sound, when driven out of my One M9, succeds all if my past iems, including my old er-4s. I must note something however. I find the treble to be of amazing quantity and quality, similar to the er-4s. I guess either the other reviews were used on very warm sources or our ears are just plain different. Who knows. All i can say is my Roxannes suit my tastes very well but im currently only driving them out of a smartphone. Who knows what higher quality DAPs will reveal.