KEF T105 System. Audio output channels: 5.1, RMS rated power: 650 W, Recommended usage: Home theatre. Acoustic amplification: 90 dB. Satellite speaker type: 2-way, Satellite speakers RMS power: 100 W, Satellite speaker frequency range: 80 - 30000 Hz. Subwoofer type: Active, Subwoofer RMS power: 250 W, Subwoofer frequency range: 30 - 250 Hz. Power source: AC