Philips SHP9500 Over-Ear Hi-Fi Headphones - Philips SHP9500/00 These high-quality headphones from Philips have been developed to give an outstanding audio experience along with stylish good looks. The open acoustic design eliminates air pressure behind the 50mm drivers giving the diaphragm greater freedom of movement and greatly enhancing the sonic clarity. The ear-shells have also been engineered to fit the natural human geometry so sound is channeled directly into the ears creating a dynamic and authentic audio experience.