If you are looking at these speakers then you know what they are - if you have any questions please feel free to ask. Rogers LS3/5A Classic Specifications · System type: Two way infinite baffle · Frequency response: 80Hz-20KHz +/-3dB · Nominal Impedance: 15 Ohms · Bass/midrange: 110mm Bextrene cone · Tweeter: 19mm Mylar dome · Crossover frequency: 3KHz · Sensitivity: 82.5dB/W/M · Finish: Walnut, Rosewood and Olive · Grille: Black Tygan · Dimensions: 305 x 190 x 165mm (HxWxD) · Weight: 4.9Kg (each speaker) · Recommended amplifier range 30-80 Watts · BBC-licensed LS3/5A