Hifiman re 600s songbird high performance in ear monitors iem latest version v2 the new re600s earphones were part of a multi year project for hifiman intended to offer a higher level of performance and comfort for the category advanced ergonomic design aids both ease of use and comfort while an all new custom designed driver utilizes a special titanium coating for remarkable detail and extended frequency response in fact the re 600s driver is patent pending the addition of neodymium ma