So I'm watching the video on YouTube from the 2017rmaf: Did this guy think he is a dolphin? He is suggesting he can hear down to 200 dB and that it is not only a slight difference but he says it makes a huge difference... BS detector went into hyperdrive there. Is this audible? Are the measurement machines accurate enough down there? Second thing he says about his son noticing the sound difference from a slight modification of the Dave prototype DAC. This is off a kids tv show. Second ping from the bs detector. Does his son also comment everytime the volume is slightly different? I know of zero nine year olds that would comment over audio quality like this. Maybe going from an iPhone to a 5.1 surround system. I know his dacs get many praises but from that video he seems like a used car salesmen. Compared to watching the video from 2016 about headphone advances is night and day. The whole panel there was great and didn't make outlandish claims.