PSB M4U1 Noise Cancelling Over-Ear Headphones M4U 1 headphones are made to go where you and your music go, bringing you the most accurate sound everywhere you listen. Designed and scientifically tested by PSB’s founder and legendary acoustic engineer, Paul Barton, and carefully fused with the M4U 1’s internal headphone drivers, RoomFeel delivers a truly immersive experience for music, movies and videos, and brings you closer than ever to your favourite recordings. With PSB M4U 1 headphones, you’ll always be with the well-balanced, amazing sound