NOCS has announced its NS900 ($250) on-ear headphones, billed as a “professional DJ headphone.” The NS900 comes with 40mm titanium drivers and interchangeable ear cushions. A stainless steel headband is bolstered by an internal headband with steel hex screws. NS900 uses a lock to keep the audio cable secure. Three exchangeable cables come with the headphones, including a cable with a three-button remote and mic. NOCS’ NS900 is available…