Open-back Sound with Excellent Noise Isolation AKG K553 MKIIs provide noise isolation on par with closed-back headphones, along with a transparent sound reminiscent of open-back designs. Upgraded 50mm transducers serve up top-shelf sound, while soft ear pads ensure comfort over long sessions. You can expect great sound when listening to music on your tablet or smartphone, thanks to low-impedance drivers. Beyond that, a detachable cable extends the life of your headphones. When you're away from your studio monitors, you can trust the sound of AKG K553 MKII headphones for editing, mixing, and critical listening.Closed-back vs. open-back Also referred to as simply "closed-" and "open-back," this distinction addresses the design of the part of the headphone that covers the area behind the driver in a straight line away from the side of your head. Closed-back headphones like the AKG K553 MKII prevent sound from escaping and leaking into your microphone. The