Fostex 8cm Cone Type Bass Reflex Dedicated Unit FF85WK Full-range

Welcome to MJ Select. We are Japanese seller. We ship authentic items from Japan. Please enjoy shopping with peace of mind! ----------------------------------------------------------- 【About Included Manuals】 If a manual is included, it will primarily be in Japanese. We recommend using image translation apps if needed. 【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction. 【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary. 【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device’s requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product. 【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer. ----------------------------------------------------------- Two-layer papermaking is a proprietary technology that creates a single cone paper consisting of two layers: a base layer and a surface layer. The FF-wk series uses long-fiber (low-beating) wood pulp for the base layer, providing high rigidity and moderate internal loss through its structure. The surface layer is blended with short-fiber (high-beating) kenaf and binchotan charcoal powder to increase the propagation speed of the cone paper surface. The edge shape is up-rolled to achieve a long stroke, and the material is a specially blended urethane foam with a polycarbonate-based material that possesses the contradictory physical properties of high loss and a high Young's modulus. * The surface color of the FF-WK series cone paper is derived from binchotan charcoal, and no dyes are used. As a result, the surface color of the cone paper will vary from one piece to another. The center cap is made of aluminum alloy and shaped like a ridge dome. This reduces high-frequency coloration by dispersing and weakening strong resonances at specific frequencies. It also has a direct connection to the voice coil bobbin, expanding the high-frequency playback range. The three-point adhesive method is used, bonding the cone paper, damper, and voice coil at the same location. By increasing the strength of the cone neck, we have achieved improved high-frequency characteristics. Furthermore, by creating a pocket shape in the damper neck, three-point adhesive is possible even when relay wires are used for the voice coil. To minimize any changes in sound quality, gold-plated Faston 205 type terminals are used for the input terminals. The FF-wk series is a full-range driver designed exclusively for bass reflex use, which has been completely redesigned from the previous FF series, adding a new 10cm diameter to the lineup. By adopting a new "two-layer paper cone" made using a new paper-making method, a ridge dome-shaped aluminum alloy center cap, and a pocket neck damper, we have achieved powerful low frequencies and characterless high frequencies while maintaining clear and realistic sound quality.