Headphones/Earphones used - HD650, VE Duke, some random earbuds. Music - Lossless tracks with sane gain levels and actual dynamics Build - Heavy, boxy, all metal, buttons have decent travel and feel UI - Decent speed, Easy menu arrangement SQ - Fake one note bass tone/timbre, fake treble tone/timbre, treble glare galore, poor dynamics, decent resolution, listenable midrange. I thought the AKM4490 in A&K300 was the worst sounding DAC chip/implementation but that crown now goes to the M1S.