2) BOSS CH6520 6.5" 250W Car Speakers + 2) BOSS CH6930 6x9" 400W Car Speakers MAX Power Handling: 125 Watts per speaker (250 watts per pair) Size: 6.5 Impedance: 4 ohms Each 100Hz-18khz Frequency Response Sensitivity: 90 dB @ 1 Watt/1 Meter