Harman Kardon's Citation One MKIII speakers belong to the category of self-amplifying speakers. This means they have a built-in amplifier, so they don't need to be connected to one to work. This feature allows you to connect a turntable equipped with preamplification and enjoy your favorite music. Their power is 40W RMS and they are 2-way, i.e. the sound frequencies are reproduced by two loudspeakers, a tweeter for the highs and a woofer for the lows. The size of the bass driver is 3.5". Finally, you can connect wirelessly via bluetooth and WiFi.