Fostex Article no: FOFF105WK



100mm (4 in) 8Ω double-layer cone of Kenaf and Bincho. New up-roll surrounds.

The FF-WK series are full-range speaker units ideally and exclusively designed for a bass-reflex enclosure. The previous FF series speaker units construction has thoroughly been redesigned on the FF-WK series. With a new addition of 10cm diameter speaker unit to the product range, new technologies such as a “double-layer” paper cone, a ridge-dome shape, aluminium alloy centre cap and a pocket neck damper have been employed for high-quality sound. The FF-WK series inherit the previous FF series bright and realistic sound character, and achieve a powerful low sound and non-characterised high frequency sound reproduction.

Double-layer cone / up-roll edge using a new material

A double-layer cone paper consists of two layers. One is a basic layer and the other is a surface layer. In the FF-WK series, a long-fibred (low freeness) wooden pulp is used for the basic layer, which has high rigidity realised by the large volume structure and appropriate internal loss. For the surface layer, the bincho charcoal powder is blended with a short-fibered (high freeness) kenaf, which allows to accelerate the propagation speed on the cone paper surface.

The up-roll edge shape realises a long stroke. A polycarbonate series material which has opposite physicalities of high loss and high Young’s modulus is specially blended with urethane foam.

(The colour tone of FF-WK series cone paper is created by the bincho charcoal and no dye is used. Due to this fact, there is a case that the colour tone slightly differs from each other.)

Ridge-dome shape aluminium allow centre cap / mechanical 2-way construction

A ridge-dome shape centre cap made of aluminium alloy is employed. Dispersing and deadening a resonance occurred at a specific
frequency with this cap helps to ease an unnecessary sound colouration at high frequency range. Also direct coupling with the voice coil bobbin expands the high frequency response.

3-point gluing / pocket neck damper

3-point gluing which glues the cone paper, damper and the voice coil at one point is employed on the FF-WK series. Increasing the strength of the cone neck section realises an improved high frequency response. Employing the pocket shape at the damper neck section has realised the 3-point gluing even with the usage of junction cable.

Faston 205 gold coating connection terminal

In order to minimise the sound variation, the Faston 205 gold coating connection terminal is employed as a speaker terminal.

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