frame diameter : 25mm (1.0 in) Nominal impedance: 8Ω VOICE COIL DC resistance: 5.4Ω Nominal power handling: 50W Continuous power handling: 100W Sensitivity (SPL1W/1m): 103+/-3 dB Frequency range: 1-20kHz Voice coil diameter: 44mm (1.7 in) Winding material: aluminium Diaphragm material: Titanuium Magnet material: Ferrite