Philips HTS3531. Optical disc player type: DVD player, Disc types supported: CD, CD-R, CD-RW, DVD, DVD+R, DVD+RW, DVD-R, DVD-RW, Playback disc formats: SVCD, VCD. Video formats supported: AVI, DIVX, MPEG, MPEG1, MPEG2, MPEG4, MPG. RMS rated power: 210 W, Audio output channels: 5.1, Audio decoders: Dolby Digital 5.1. Center speaker frequency range: 150 - 20000 Hz, Center speaker impedance: 4 Ом, Center speaker woofer size: 63.5 mm (2.5 "). Satellite speaker frequency range: 150 - 20000 Hz, Satellite speaker impedance: 4 Ом, Satellite speaker woofer size: 63.5 mm (2.5 ")