Centre speaker series q acoustics 3000 series system 2 way system speaker system 20 stereo principle passive frequency response 75 22000 hz sensitivity 89 dbmw impedance 6 ohm crossover frequency 2700 hz colour black front colour black housing surface paint speaker enclosure bass reflex number of tweeters 1 tweeter type tweeter calotte number of subwoofers 2 bass chassis 100 mm width 430 mm height 150 mm depth 200 mm weight 6 kg