iFi Audio Micro iCAN SE Headphone Amplifier

Fantastic clarity. Beautiful bass boost.Very powerful BUT.......Completely unusable thanks to a constant buzzing noise.Put the amp into high gain and the damn thing sounds like my nutri bullet.2 stars. One for the bass boost and one for the build quality.BTW, some people will tell you that it's normal for an amp to buzz!!!I have a Fiio E09k. It cost £100. It's absolutely silent, even on high gain. So I wouldn't tolerate a £300 amp doing it.