The PS1000 has an inner sleeve of a selected species of hand-crafted mahogany made by using an intricate curing process. Its outer housing of metal machined from a special non-resonant, very hard metal alloy utilizes a special processing and casting method to increase the porosity of the alloy. This combination of wood and metal insures that the earphone chamber has no "ringing" which might obscure detail or add coloration. The way the wood and metal housing moves air and reacts to sound vibrations is now virtually unaffected by transient distortions. Grado has also designed a new cable for the PS1000. The eight-conductor cable design, utilizing UHPLC (ultra-high purity, long crystal) copper, improves control and stability of the total range of the frequency spectrum. The PS1000 also utilizes a newly re-configured voice coil and diaphragm design, resulting in unsurpassed speed and accuracy response. The cushion design creates the correct balance between the driver and hybrid housing to give the resulting musicality desired. The cushion design also makes the PS1000 one of the most comfortable to wear headphones in the world. Grado has taken all their knowledge and years of experience in controlling resonances and eliminating distortions and this has culminated in the development of their finest headphone ever, the PS1000. Listen, enjoy and agree.