is there a difference when it comes to 2-channel music or movies? for instance, the pioneer dv-275-s & dv-578a-s both list their audio dac's as 24-bit/192kHz, the latter having these for 6 channels to accomodate dvd-audio and sacd formats. however for non-dvd-audio or non-sacd material, will you notice any difference? thanks in advance.