What I mean to say is if a $85 DAP and a $3500 DAP both have specs that are beyond the capability of human hearing shouldn't they both be "transparent" A.K.A "equal" in their sound reproduction? I understand that they will likely have different power output......but once you account for that shouldn't they sound the same if you're using the same headphones (and assuming both can adequately drive said headphones)? How can one DAP be more "bassy" than another? Or have more midrange or be "brighter". If they both have specs beyond human capability won't they sound the same? I can see where different headphones can sound VERY different even when they profess similar specifications. Headphones don't reproduce sound in a completely flat 20hz-20khz line; Most DAC's do. This isn't an argument against buying more expensive DAP's. You usually get something for your extra dollars (possibly the ability to play more formats, better fit-n-finish, longer battery life, better UI.......etc.......but better sound reproduction......really?) Could people consistently pass a double blind between the Xduoo X3 and the Astell & Kern AK380 playing the same recording through the same iem's?