Panasonic Car Audio Model EAB-A43 with Dual Cone Speaker System, 10 cm size. Technical Specifications: Speaker Size: 10cm Dual Cone Speaker Maximum Input Power: 40 watts Frequency Response: 50Hz~20KHz Sound Pressure Level: 91dB/W/m Voice Coil Impedance: 4 ohms Additional Specifications: Water-Resistant Cone and Magnet Weight 103 grams. For clarification, one speaker is Sony and the other is Panasonic.