Bookshelf speaker power rating 60 watt system 2 way system principle active frequency response 46 32000 hz sensitivity 89 dbmw impedance 8 ohm crossover frequency 1800 hz recommended amplifier power 25 120 capacity 108 litres power supply mains operation colour brown cabinet surface walnut design down firing subwoofer speaker enclosure bass reflex number of tweeters 1 treble chassis 25 mm number of subwoofers 1 bass chassis 150 mm