JL Audio M100-CT-CG-WH 1" Silk Dome Marine Tweeters Power Handling: 100W RMS / 300W Peak Recommended RMS Amplifier Power (per Ch.): 40W - 175W System Efficiency: 91.0dB @ 1W / 1m System Nominal Impedance: 4 System Frequency Response: 4kHz - 25KHz  3dB