The technology is changing quickly. Your question is relevant. The issue is whether or not the new DACs sound better to you. The newer ESS chips sound better to some but others like the NOS DACs. Vanilla or chocolate? My advice is that you will have to experiment. Trying to keep upwiththe latest tech in DACs is fruitless. It is impossible for a manufacturer to design a DAC to accept every new chip that comes along. Can you hear the difference? I propose that the software that plays your bitstream may be more important.
upgradeable dacs
I am tired of wasting money on buying dacs to have them be usurped by new technology within a year of purchase. many dacs that claimed being upgradable either were not, or were so expensive as to be not worth it. (original berkeley and bel canto come to mind) Other than the new nad dac line which i think really can be upgraded, does anyone know of higher quality dac products which can be upgraded without any nonsense? thanks