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Products>>>Speaker>>>Telephone speaker       Diameter: Cone Material: Edge: Nominal Power: Maximum Power: Impedance:   Voice coil: Fo: Response: S.P.L:   Magnet Size: Net weight: Φ50mm Paper Paper 0.2w 0.4w 8±15%Ω Φ13.3mm 450±20%Hz   Fo-4kHz   84±3dB/W/M Φ13×10(AlNiCo) 44.5g