Additional speaker series elac debut power rating 50 watt effective output 70 watt system 2 way system principle passive frequency response 170 20000 hz sensitivity 85 dbmw impedance 6 ohm crossover frequency 5000 hz recommended amplifier power 30 80 power supply passive colour black front colour black housing material mdf enclosure speaker enclosure closed number of tweeters 1 treble chassis 13 mm number of subwoofers 1 bass chassi