plastic speaker SP-02 power( RMS/ MAX) : 3w/ 5w Impedance: 8¦ ¸ Lowest resonance frequency: 700Hz¡ À 140Hz, at free air 1.0v Mean sound pressure level: 90dB¡ À 3dB, input signal 1w, distance 0.5M at 1K, 1.2K, 1.5K, 2KHz average Frequency range: fo-4KHz Frequency response: as shown Operation test: must be normal, program source 3w Buzzes & rattles: must be normal, sine wave 4.8v Distortion: 5% max., rated input at 1.0KHz Insulation: 10M¦ ¸ up, AC 250v