Exceeding Sound Quality: Following the design principle of the flagship A8000, the new A4000 adds a new entry-level earphone to the A-series. With transparent sound and overwhelmingly natural response the A4000 provides localised and spatial sound that emerges with a deeply extended sound image. | Newly Developed High Precision Dynamic Driver: A4000 is equipped with a powerful high precision f-Core DU 6mm dynamic driver unit newly designed from the ground up to create high-quality clear and powerful sound. | A Custom Made Feeling: final A4000 achieve an excellent, custom feeling fit based on a 3-point housing design that is considered by final to be the optimal solution for in-ear earphone fit without the feeling of unnecessary pressure. | 2-Pin Connector + Original OFC Cable: The 2Pin connector is a highly accurate in-house developed product that uses the 0.78 standard, which is said to be the most versatile. With a soft and supple covering material in consideration of touch noise, it bends flexibly even when using ear hooks, achieving a perfect fit.