Abyss Diana PhiThe DIANA headphones were launched in 2018 as a luxury line touted as the worlds thinnest boutique headphone. It has since changed longstanding perceptions of headphone physics by easily comparing to and in many cases besting the highest performance headphones. World class sound in a compact portable package. ABYSS has since worked toward furthering this success, producing this second higher performance Phi version thats bigger on the inside by