The YSP-1100 contains 42 digital amplifiers to power 42 sound drivers, delivering remarkable multi-channel enjoyment from a single, elegant component. As amazing as it seems, the YSP-1100 can actually deliver multi-channel sound that surrounds listeners the same way that sound from front, center and rear speakers does. DVD movies and other digital sources sound just the way they are supposed to. Dolby Pro Logic II is included, so even 2-channel TV sound can be heard in glorious multi-channel surround. Remember, this is true surround sound, not virtual surround, which can cause listening fatigue.