frame diameter: 395mm (15 in) Nominal impedance: 8Ω VOICE COIL DC resistance: 5.4Ω Nominal power handling: 550W Continuous power handling: 550W Sensitivity (SPL1W/1m): 95+/-2 dB Frequency range: F0~2.5 kHz Voice coil diameter: 86mm (3 in) Winding material: COPPER Diaphragm material: PAPER Magnet material: Ferrite