"Merely" 20 bits of resolution could kill you. 13 or 14 is more than enough. 24 bit DAC can process 24 bit word data lenght, this 20 bit refers to noise floor - if processing 24 bit data it can achieve "only" 20 bits of accuracy (the rest is covered by noise, although it has to be mentioned that one would have to apply crazy gain to make this noise disturbing). You should check sound science forum, there is a thread explaining 16 vs 24 bit.
Btw does anyone remember what is the resolution of vinyl discsc translated into bits? Was it something like 10?
Edited by MaciekN - 5/14/14 at 12:13am