Floor speaker series heco celan gt power rating 200 watt system 3 way system principle passive frequency response 25 50000 hz noise level 91 db impedances 4 6 8 ohm crossover frequencies 320 3300 hz recommended amplifier power 30 330 power supply passive housing surface paint housing material mdf enclosure control feature high channel control speaker enclosures bass reflex removable speaker cover number of tweeters 1 treble chassis 30 mm