The rpx46 - 4-inch by 6-inch 2-way coaxial car speakers are great factory replacement speakers, providing rich, clear, and powerful sound. They work great on factory radio power or amplified power, and feature high quality build materials such as a microfiber paper cone and premium butyl rubber surround. All of these aspects of the speakers design allow it to offer great sound and long lasting reliability. The speakers feature a 20mm premium silk dome tweeter. Frequency response: 40-20,000 Hz. Sensitivity: 91 db. Sold as a pair. Impedance: 4 ohms. Max power: 150 watts (pair), rms power: 45 watts (pair). Peak power handling : 150 watts per pair (75 watts each) Microfiber paper cone & butyl rubber surround 20Mm soft dome silk tweeter Frequency response : 40 - 25,000 Hz +/- 3 dB Sensitivity : 91 dB