System: 6*9" 3-way Coaxial Speaker Tweeter: 50 mm PEI cone tweeter Magnet: 20 OZ Voice Coil: 1.2" Impedance: 4 Ohms Power: 150 Watts RMS,250 Watts Peak Frequency: 50Hz-30k Hz Senditivity: 91dB/M.W Carton: 51*42*29 CM Qty./Ctn: 4 pairs