|Originally posted by Canman
Sean H is right on the money...the delta/sigma (1-bit) style converters are used mostly in budget cd players. I don't think you want to specifically look for that chip.
Not all delta/sigma converters are 1-bit designs. Plenty of the Crystal Semiconductor DACs use a multibit delta-sigma design. The Crystal CS43122 is one of the finest DAC chips in the world (and priced accordingly!) and uses such a design.
In general, I've found that Crystal DACs tend to be slightly on the warm/rich side, especially compared to DACs from Analog Devices and AKM, which sound on the analytic/slightly bright side. (I don't have enough experience with Burr-Brown or Wolfson DAC chips to comment on how they sound.)
There are plenty of standalone CDPs that use Crystal DACs. The NAD T532 is one example, but I can't recommend it because the highs can be grainy for reasons I can't quite fathom (not irritating or bright, just grainy... odd). On the other hand, the Grace 901 DAC/headphone amp uses the expensive CS43122 DAC chip and is widely praised (check out the two-part review in Stereophile for impressions and some pretty stunning measurements).