frame diameter: 25mm (1.0 in) Nominal impedance: 8Ω VOICE COIL DC resistance: 5.4Ω Nominal power handling: 20W Continuous power handling: 50W Sensitivity (SPL1W/1m): 90.0+/-3 dB Frequency range: 1-20kHz Voice coil diameter: 34mm (1.2 in) Winding material: aluminium Diaphragm material: Mylar Magnet material: Ferrite