Bookshelf speaker bluetooth speaker power rating 100 watt system 2 way system speaker system 20 stereo principle active amplifier type digital power supply mains operation colour white housing surface veneer function streaming control feature bluetooth pairing speaker enclosure closed number of tweeters 1 treble chassis 25 mm number of subwoofers 1 bass chassis 100 mm speaker terminals screw terminal analogue inputs analogue audio input rca