Floor speaker series heco victa prime power rating 160 watt effective output 280 watt system 3 way system frequency response 26 40000 hz sensitivity 91 dbmw impedances 4 6 8 ohm crossover frequencies 450 3250 hz recommended amplifier power 30 280 housing material mdf enclosure speaker enclosure bass reflex number of tweeters 1 treble chassis 25 mm number of mid range drivers 2 midtone chassis 120 mm number of subwoofers 2 bass chassis