Bluetooth speaker portable speaker power rating 90 watt system 2 way system principle active crossover frequency 2800 hz amplifier type digital power supply mains operation colour black function streaming control features high channel control volume control bass level control bluetooth pairing design front firing subwoofer number of tweeters 2 treble chassis 25 mm number of subwoofers 2 bass chassis 133 mm analogue inputs analogue audio input rc