ELAC B5 Debut Series 5.25" Bookshelf Speakers by Andrew Jones (Pair) Custom Drivers Woven Aramid-Fiber Woofer and binding posts is 5-way metal Deep-Spheroid Custom Waveguide and Intricate Crossover.Tweeter:1x 1 inch (2.54 cm) cloth dome Nominal/peak power handling: 50 / 120 wpc , Nominal impedance: 6 ; minimum 5.4  , Recommended amplifier power: 30 to 120 wpc Sensitivity: 85 dB at 2.83 v/1m , Woofer: 1 x 5.25-inch woven aramid-fiber cone , Crossover frequency: 3,000 Hz , Frequency response: 46 to 20,000 Hz