Purpose...The DACs you see are "outboard" units that can be substituted for the DACs that you already have inside your disc player. In the bad old days, players often had inferior DACs, and sonic quality would be improved by using the outboard unit. But, beware! The quality of run-of-the-mill DACs has improved greatly in the last year or so, and even an inexpensive player may have DACs superior to an expensive outboard DAC that is a few years old.
