Floor speaker series heco victa prime power rating 170 watt effective output 300 watt system 3 way system frequency response 25 40000 hz sensitivity 91 dbmw impedances 4 6 8 ohm crossover frequency 350 3250 hz recommended amplifier power 30 300 housing material mdf enclosure speaker enclosure bass reflex number of tweeters 1 treble chassis 25 mm number of mid range drivers 1 midtone chassis 170 mm number of subwoofers 2 bass chassis