When my macbook is on charge, there is a distinct buzzing noise in the background coming from the speakers. When the macbook is unplugged, the sound is clear. For playback I use a 2014 Macbook Air with a couple Presonus Eris E8 speakers. I listen mainly to electronic music, but looking for a flat response. My speakers are pre-amplified studio monitoring speakers, so I don’t need amplification at the moment. I’m playing Flac files mostly, mainly CD rips so 44 Khz 48 Khz and 16 bit, but I also have a few files that are 96 Khz and 192 Khz and sometimes 24 bit. I’m looking for a DAC that I can connect through USB and with one jack or minijack out, price range from 100$ to 200$. Also interested in some Foobar / Clementine mac alternative. Thanks for any advice!