Harman/Kardon HKTS 20. Audio output channels: 5.1, RMS rated power: 640 W, Recommended usage: Home theatre. Amplification device type: amplifier, Amplifier output power: 80 W. Satellite speakers RMS power: 80 W, Satellite speaker frequency range: 45 - 20000 Hz, Satellite speaker impedance: 8 Ом. Center speaker RMS power: 120 W, Center speaker frequency range: 45 - 200 Hz, Center speaker impedance: 8 Ом. Subwoofer type: active, Subwoofer RMS power: 200 W, Subwoofer frequency range: 45 - 200 Hz