Fostex’s RP unit adopts a rectangular design, with a lightweight and highly durable polyimide film inside. A serrated coil is added to the film, which can provide more natural information transmission performance. Fostex further expands the overall area of the RP unit of TH1000RP, and uses a total of 11 sets of magnet arrays to balance the magnetic flux distribution of the headphones, bringing higher sensitivity while suppressing distortion.
In designing the TH1000RP, Fostex specifically used maple wood, commonly found in guitars, for the housing to leverage its high hardness and density. This enhances the brightness of the high frequencies and makes the details more distinct. Additionally, they employed the traditional Japanese indigo dyeing technique, Aizome, to color the housing. The use of Aizome not only enriches the appearance but also preserves the acoustic properties of the maple wood, ensuring a firm bass and clear, extended treble.
The open-type TH1100RP reproduces a natural sound field with a high resolution and a low lis-tening fatigue, which is appropriate for the premium open-type RP, using double aluminum etched parts in the housing aperture and careful fine-tuning of the aperture ratio and each inter-nal part.
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