Bluetooth speaker wireless subwoofer wifi speaker series philips izzy power rating 5 watt speaker system 20 stereo principle active frequency response 100 16000 hz sensitivity 81 dbmw noise level 62 db impedance 4 ohm power supply mains operation colour black front colour black function streaming controllable via buttons knob control features bluetooth pairing onoff volume control playpause speaker enclosure bass reflex number of full