The 900 HMV are full ear-cup USB-based headphones that use the C-Media CMI108 chipset, making them plug-n-play. Though these cans look heavy, they’re pretty light without sacrificing on build quality.The sound quality is really good: well-produced, deep bass, and the vocals crisp and distinguished—just the way we like our music! The extreme highs are slightly weak, but you will rarely feel the loss under most usage scenarios.