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-fibered (low freeness) wooden pulp is used for the basic layer, which has high rigidity realized 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.
Specifications
power handling (continuous/programme) = 30/90 W
frequency range = 50-21000 Hz
resonance frequency fs = 50 Hz
impedance R = 8 Ohm
sound pressure level SPL = 92 dB (2,83V; 1m)
DC resistance Re = 6,5 Ohm
force factor BL = 7,23 N/A
effective piston radiating area Sd = 132 cm2
effective mechanical mass incl. air load mms = 9,5 g
equivalent volume of compliance Vas = 27,83 l
total Q factor Qts = 0,34 (Qms=4,19, Qes=0,37)
voice coil diameter = 35 mm
maximum peak linear excursion vibration xlin = +/- 1,85 mm
