Bookshelf speaker power rating 60 watt system 2 way system principle active frequency response 45 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 design down firing subwoofer speaker enclosure bass reflex number of tweeters 1 treble chassis 25 mm number of subwoofers 1 bass chassis 150 mm subwoofer material woofer