Spent some good listening time with GR01 last night, settled on Cowon J3 for their source, I'm pretty impressed with what I'm hearing, seemingly the best dual BA I have heard. Sibilance did settle and I think on that first listen I was really giving them to much volume which would of occurred with other IEM's. Things that really impress me are imaging is very accurate and those BA's are fast, soundstage has decent width also treble detail is really impressive.Another thing that struck me was their channel separation (left/right/middle) all distribute well. Most of all GR01 hold an agreeable vibe which can likewise be found in Vsonics GR07.
To my ears I think they're superior to GR07 noticeably in detail and separation but maybe not as versatile to every genre, those who like low ends of dynamic driver may not find GR01 sufficient, so it's not an IEM I could recommend to anyone but for those who have acquired that taste. As all Knowles associated IEM's have a certain tonality, they share to a degree light weight low end however, that is what gives these dual BA's their signature. I think anyone who is fan of R-50 should be checking these out, whether or not the extra money is worth it for GR01 I can't say, they seem to be a little more advanced than R-50 going off memory.
Overall I'm very at home with the $180 purchase, they're well suited when I lay down at night listening to music. Rather delicate trait similar to the DBA-02 and R-50.Edited by H20Fidelity - 7/18/13 at 7:57pm