Both crossovers upgraded with film capacitors – Original volume pots in the back fully cleaned and lubricated – New speaker foam on bass drivers – New grill cloth. All components are 100% original. Drive Units: 305 mm (12 in) acoustic suspension woofer, 38 mm (1 1/2 in) midrange hemispherical dome, 199 mm (3/4 in) high-frequency hemispherical dome. Crossover: 575 Hz, 5000 Hz Impedance: 4 ohms nominal Controls: Midrange and high-frequency driver level controls Amplifier: Up to 100 watts per channel Size: 356 x 636 x 289 mm deep (14 x 25 x 11 3/8 in) Weight: 24 kg (53 lb) Woofer resonance: Free air 18 Hz, in enclosure 42 Hz Volume of enclosure: 48.2 litres (1.7 cu ft).