Samsung HT-D6750WK. Optical disc player type: Blu-Ray player, Disc types supported: BD-R, BD-RE, BD-ROM, CD, CD-R, CD-RW, DVD, DVD+R, DVD+RW, DVD-R, DVD-RW. Video formats supported: DIVX, MKV, MP4, MPEG4, WMV, Analog signal format system: NTSC. Audio output channels: 7.1, Audio decoders: Dolby Digital, Dolby Digital Plus, Dolby Pro Logic II, Dolby TrueHD, DTS, DTS-HD, Audio formats supported: MP3, WMA. Front speaker frequency range: 140 - 20000 Hz, Front speaker sensitivity: 86 dB, Front speaker impedance: 3 Ом. Center speaker frequency range: 140 - 20000 Hz, Center speaker sensitivity: 86 dB, Center speaker impedance: 3 Ом