Bookshelf speaker series q acoustics 3000 series system 2 way system speaker system 20 stereo principle passive frequency response 68 22000 hz sensitivity 86 dbmw impedance 6 ohm crossover frequency 2800 hz power supply passive colour black front colour black housing surface leather speaker enclosures band pass removable speaker cover number of tweeters 1 tweeter type tweeter calotte number of subwoofers 1 bass chassis 100 mm width 15