This is from Yamaha's "features" blurb....\n\n\nOptical & Coaxial Digital Inputs: The A-S801 is equipped with both optical (toslink) and coaxial (RCA) digital audio inputs. The optical and coaxial inputs will accept 2ch PCM (not Dolby Digital\/DTS). The audio stays in the digital domain, giving you pure, pristine dynamic sound for all your entertainment sources, from sports and other programs to movies and concerts.\n\nWhat does that mean? "The audio stays in the digital domain"?\n\nAlso does anyone know what Class amplifier it is? \nThanks for the help.