Floor speaker series dali zensor system 2 way system principle passive frequency response 43 26500 hz sensitivity 88 dbmw noise level 108 db impedance 6 ohm crossover frequency 2400 hz power supply passive colour beige housing surfaces paint veneer housing material mdf enclosure speaker enclosures bass reflex removable speaker cover number of tweeters 1 treble chassis 25 mm tweeter material tweeter tissue number of subwoofers 2 bass ch