Specs Nominal Impedance : 8 ohms Recommended Amplifiers : 10 to 120 Watts Frequency Response : 35hz to 30Khz Sensitivity : 86.5 dB linear for 1 watt at 1 metre Bass/Midrange : 5 7/8" (150mm) Polymer Impregnated Kevlar cone with black acrylic phase plug Tweeter : 3/4" (20mm) ProAc silk dome with damped front plate. Mirror image offset configuration Crossover : Finest components on dedicated circuit board. Multistrand oxygen-free cabling throughout, split for optional bi-wiring/ bi-amping Dimensions (HxWxD) : 270 x 150 x 235 mm ( including grille ) Weight : 5 Kgs / each Mode : Stand mounted Grille : Acoustically transparent crimplene Finish : Maple