Alpine SPJ-161C2 6" Coaxial Car Speakers FEATURES: 6" Type-J Series 2-Way Coaxial Car Speakers, Power Handling: Peak: 250 watts per pair / 125 watts each. RMS: 50 watts per pair / 25 watts each. Recommended Power Range: 10 - 25 watts RMS per channel, Built to handle all bass levels down to the lowest frequencies, High efficiency and low distortion, Deeper bass, higher trebles and greater dynamic range than previous models, Rubber magnet boot cover, 4 ohms impedance, and Frequency Response: 30 - 30,000 Hz.