frame diameter: 460mm (18 in) Nominal impedance: 8Ω VOICE COIL DC resistance: 5.6Ω Nominal power handling: 800W Continuous power handling: 1000W Sensitivity (SPL1W/1m): 97.5+/-2 dB Frequency range: F0~1 kHz Voice coil diameter: 100mm (4 in) Winding material: COPPER Diaphragm material: PAPER Magnet material: Ferrite