Newbee, that's an interesting point. Some manufacturers are trying to get the best out of their D/A converters by optimizing the digital circuitry, but they pay less attention to the... D/A converter's analog part. I think it has to do with costs. A good discrete analog section add a significant amount to the total costs of a unit. So these manufacturers use OPamps because they are cheaper. But I think these OPamps are still inferior to well executed discrete analog amplifiers. Why are many so called reference "oldskool" DAC's (Wadia 9, Goldmund 10C, Accuphase DC-91, Krell Ref 64) still sound so good after nearly 20 years? Well I think mainly because of the high quality design of their (discrete) analog sections.
Chris
Chris