The ATH-A550Z art monitor closed-back dynamic headphones incorporate proprietary large-aperture 53 mm drivers with CCAW bobbin-wound voice coils to deliver audiophile-quality acoustic performance with linear frequency response The drivers also feature a top-mounted PCB which contributes to smoother airflow for precise diaphragm movement Audio-Technica's improved 3D wing support system provides an excellent comfortable fit aided by the headphones' soft premium-grade ear pads The 3 0 M (9 8') tangle-free cable is cloth-wrapped for lasting durability