http://www.youtube.com/watch?v=1CkyrDIGzOE&feature=g-wl Some of these are just talking, some are highly technical. All are modern, state of the art from the current experts. Make of them what you will. This one's particularly good as it veers from DAC design to psychoacoustics and back in one hour. The bit about the audibility of various distortions and noise in the presence of signals really blows that 'but you can't possibly hear that' argument away. There's a lot more from the RMAF too. I hope they continue to video and post these each year.