Harman/Kardon SB 10. RMS rated power: 420 W, Audio output channels: 3.1. Impedance: 8 Ом, Frequency response: 45 - 20000 Hz, Crossover frequency: 2200 Hz. Subwoofer type: Active, Subwoofer RMS power: 200 W, Subwoofer frequency range: 45 - 200 Hz. Receiver type: Built-in. Power source: AC, AC input voltage: 100-240 V, AC input frequency: 50/60 Hz