Philips HTS5550. Signal-to-Noise Ratio (SNR): 65 dB, Audio formats supported: MP3 WMA, MP3 bit rates: 32 - 320 Kbit/s. Supported radio bands: FM. Center speaker impedance: 3 Ом. Subwoofer type: Passive, Subwoofer driver size: 25.4 mm (1 "), Subwoofer frequency range: 20 - 150 Hz. Center speaker weight: 1400 g, Subwoofer weight: 5370 g