Philips TAB5309/10. Audio output channels: 2.1 channels, RMS rated power: 120 W, Audio decoders: DTS 5.1, DTS Virtual:X, Dolby Digital, Dolby Digital Plus. Impedance: 8 O, Total Harmonic Distortion (THD): 10%, Woofer diameter (imperial): 13.3 cm (5.25"). Subwoofer type: Active subwoofer, Subwoofer connectivity: Wireless, Subwoofer frequency range: 40 - 150 Hz. Product colour: Grey, Colour name: Dark gray, Audio formats supported: FLAC, LPCM, MP3, WAV. Connectivity technology: Wired & Wireless