The newly designed AKG® K551 headphones are optimized for a fully immersive listening experience and for comfort. Starting with a 2” (50mm) driver on each ear, these reference-class headsets use Real Image Engineering to create a highly realistic sound environment with a true sense of dimensional space. Lightweight, with a comfortable fit, this head phones have incredible passive noise reduction and extremely low sound-leakage levels that will keep you living blissfully inside your sound environment for hours on end.