Teufel Theater 400 5.1-Set Cinema. Audio output channels: 5.1, Recommended usage: Home theatre. Amplification device form factor: built-in. Center speaker type: 2-way, Center speaker frequency range: 90 - 20000 Hz, Center speaker impedance: 4 Ом. Subwoofer RMS power: 250 W, Subwoofer frequency range: 40 - 240 Hz. Power source: AC