RE Audio REX5.7 5 x 7 Inches Co-Ax Kit - Set of 2 Power Handling: 125W, Nominal Rating: 70W Frequency Response: 55-20,000Hz, Efficiency: 90dB Impedance: 4 Ohm, Lowest Resonant Frequency: 100Hz, Crossover Frequency: 4,500Hz Mounting Depth: 61mm, Dimensions: 232mm x 174mm Surround: Rubber, Black Polyester Diaphragm: P.E.I.