Logitech Z533 - speaker system - for PC Product Type Speaker system - for PC - 2.1-channel System Components 2 speakers, subwoofer Speaker Type Active Nominal Output Power (Total) 60 Watt Frequency Response 55 - 20000 Hz Amplifier Integrated Speaker System Details 2 x satellite speaker 15 Watt 8 Ohm | 1 x subwoofer 30 Watt 4 Ohm Power AC 120/230 V (50/60 Hz)