Wifi speaker power rating 18 watt principle active frequency response 80 18000 hz sensitivity 78 dbmw noise level 90 db impedance 4 ohm amplifier type digital colour black function streaming control feature volume control number of full range drivers 1 number of tweeters 2 treble chassis 64 mm number of subwoofers 1 bass chassis 102 mm analogue input 35mm jack line in wireless transmission wifi width 310 mm height 160 mm depth 1