frame diameter: 210 mm (8 in) Nominal impedance: 8Ω VOICE COIL DC resistance: 5.4Ω Nominal power handling: 400W Continuous power handling: 600 W Sensitivity (SPL1W/1m): 99 +/-2 dB Frequency range: F0~5 kHz Voice coil diameter: 55mm (2 in) Winding material: copper Diaphragm material: PAPER Magnet material: Neodymium