Boston Acoustics A 2310HTS. Audio output channels: 5.1, Recommended usage: Home theatre. Satellite speaker type: 2-way, Satellite speaker frequency range: 80 - 25000 Hz, Satellite speaker crossover frequency: 2200 Hz. Center speaker type: 2-way, Center speaker frequency range: 80 - 25000 Hz, Center speaker crossover frequency: 2500 Hz. Subwoofer RMS power: 250 W, Subwoofer frequency range: 35 - 150 Hz, Subwoofer driver size: 254 mm (10 "). Power source: AC