Built from Hemp The highly compressed hemp creates a damping effect between their fibers. This produces a fuller sound, comprised of a noticeable low end and a top end that extends smoothly to its limits. The hemp may be doing the heavy lifting, but the hemphone is a joint effort.High Expectations The last seven decades has given Grado time to perfect its sound, letting the headphones reveal new notes and details in songs heard hundreds of times. The Hemp Headphone is a slow burn, constantly getting better with every listen.