Fostex FF125WK, FF-WK-Serie, full range speaker, 120mm, 5", 8 Ohm, fs ~ 22kHz
The new FF-WK series replaces the FF series with kenaf membrane. Completely revised, the series offers a number of new technologies such as a double-layer paper cone (kenaf/wood fiber), a stiffened aluminum dust protection dome and a newly developed suspension.
Features und technische Daten
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Size: 120mm/4.8”
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Overall diameter: 117mm/4.7”
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Baffle hole diameter: 104mm/4.1”
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Depth: 61.3mm/3.0”
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Voice coil diameter: 25mm/1.0”
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Cast/Stamped: Stamped
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Impedance: 8
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Reproduction frequency response: fs ~ 22kHz
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Sound pressure level: 89dB/W(m)
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Rated input: 16W
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Music power: 50W
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Magnet weight: 388g/0.855lb
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Net weight: 920g/2.028lb
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Equivalent diaphragm radius a: 46mm
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Effective cone diameter D: 92mm
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Surface area of cone Sd: 0.0066m2
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Nominal impedance Zn: 8
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Resonance frequency Fs: 67Hz
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DC resistance Re: 6,7
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Coil inductance Le: 0.044mH
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Mechanical Q Qms: 5.091
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Electromagnetic Q Qes: 0.464
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Total Q Qts: 0.42
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Equivalent mass Mms: 5g
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BL product (Factor force) BL: 5.596Tesla/m
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Compliance equivalent volume Vas: 7.265L
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Voice coil overhang Xmax: 1.65mm
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Reference efficiency n0 Eff/n0: 0.451%
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Mechanical compliance of suspension Cms: 1.153m/N
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Efficiency bandwidth product EBP: 144.397
