The TH1000RP and TH1100RP are flagship RP headphones that incorporate Fostex's proprie-tary state-of-the-art premium grade RP planar magnetic driver technology in a solid wood hous-ing. Dyed with Aizome from Tokushima, known as Japan's reknowned indigo dyeing method, the headphones are carefully assembled in Japan. This one-of-a-kind texture brings out the beauty of the individually different wood grain that is unique to traditional Aizome. Fostex's 50 years of flat diaphragm RP technology come together beautifully in two models of flagship headphones, a closed type and an open type. Premium RP planar magnetic driver: The RP technology planar diaphragm driver technology, developed in 1974 and continually re-fined ever since, has a newly developed planar diaphragm, much larger than the conventional RP driver used in T50RPmk3/mk4. In addition to increasing the number of magnets that sand-wich the diaphragm, as well as a newly designed pattern and shape for the printed coil, the magnetic circuit components have been redesigned to optimize the magnetic flux distribution. All of these work together to suppress unwanted resonance in the diaphragm. This simultane-ously achieves high sensitivity, smooth frequency response, and excellent transient characteris-tics, enabling accurate and delicate reproduction from heavy bass to high frequencies, and the ability to express a clear sound image in space with a clear sense of localization. Hard maple solid wood housing finished with "Aizome,” a traditional Japanese dyeing method: The solid hard maple wood housing, known as a material for guitars, is dyed with Awa Aizome from Tokushima, which has long been valued for its high-quality dyeing. The wood is carefully dyed one by one by skilled craftspersons, resulting in a deep indigo color that beautifully re-veals the unique grain of the hard maple wood.