With Dolby® Master Studio™ certification, the iL-90MV delivers a Signal-to-Noise Ratio of over 99dB for highest audio quality. Dolby® Digital Live is a real-time encoding technology to convert the audio signal into a Dolby® Digital bitstream for transport and play back through a home theater system; Virtual Headphone/Speaker also enables a realistic 5.1-channel surround sound over any set of headphones or two speakers. With abit's SP/DIF solution it has never been easier to connect speaker systems. You only need one optical cable.