Its very clean sounding In-Ears. I am not a person requiring huge amounts of BASS but the BASS on RE0 is slightly less than I would have liked i to be...Having said that I find BASS to be quite Tight.  Sound Stage is average.. Instrument Seperation is quite good. With the Amp, for which I paid a small extra,.. it sounds even better.   The White Bi-Flanges are perfect for my ears. Am able to have them for prolonged times.