Free Delivery. Grado is proud to introduce the new flagship of their headphone line, the PS1000. This hybrid design has an inner sleeve of a selected species of h&-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 & casting method to increase the porosity of the alloy. This combination of wood & metal insures that the earphone chamber has no "ringing" which might obscure detail or add coloration. The way the wood & metal housing moves air & reacts to sound vibrations is now virtually unaffected by transient distortions. Grado has also designed a new cable for the PS1000.