Yamaha HPH-150 headphonesIntroducing the Yamaha HPH 150 headphones Optimally tuned for listening to electronic musical instruments, HPH 150 headphones offer excellent tonal projection, with a crisp, clear sound that you won't tire of even after prolonged use, and superb sound separation ensuring that each and every sonic detail is reproduced accurately. Open ear headphones perfect for musical instrument performance With large 40 mm diameter drivers in a rear vented format,