Beyerdynamic DT 1990 PRO vs Sennheiser HD 660 S

The Beyerdynamic DT 1990 PRO and the Sennheiser HD 660 S are both very good open-back audiophile headphones, each with their own different sound signature. The Sennheiser have a warm, smooth sound but lack thump and punch in the bass and clarity in the treble. The Beyerdynamic have a fuller, brighter sound, but they can also make sibilants and cymbals seem rather piercing. Listeners who prefer a more speaker-like passive soundstage will prefer the Beyerdynamic, which are also a bit more comfortable. On the other hand, the HD 660 S are cheaper.