Thank you, 0rangutan, for your response.
I have another question. After reading Gregorio's article on 24bit vs 16bit (http://www.head-fi.org/forum/thread/415361/24bit-vs-16bit-the-myth-exploded) I thought I was getting an understanding of the difference between the two. In short, he states that although there is a great increase in resolution in going from 16 to 24 bits with a consequent increase in dynamic range, the difference is inconsequential because of other constraints, e.g. since the dynamic range of a recording doesn't exceed 60 dB's or so, the 96 dB of dynamic range provided by a 16bit CD or some other audio file is more than sufficient. However, I came across a post by MirandaX (http://www.head-fi.org/forum/thread/9620/di-0-and-usb-digital-out#post_111729) in which she draws a distinction between the audio signal and the "internal word size of the DAC," with a 20 or 24 bit DAC actually sounding superior to a 16bit device, all things being equal, of course.
Could somebody please explain this to a n00b?
Thanks