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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:       Φ77mm       Paper       Cloth       4.0w       5.0w       8±15%Ω       Φ13.3mm       160±20%Hz       Fo-10kHz       82±3dB/W/M       Φ13×10(AlNiCo)       57.5g