Asker IMHO your asking the wrong question. Your asking the salesman / rep speal that people are brain washed into believing is still the truth.
I know a couple of people who use to design DACs for a living. It was an issue 15 years ago but no longer. It makes no difference, modern DACs are beyond the sampling capability for the human ear/brain system to tell them apart. Unless theres a level or frequency responce difference after the digital to analogue stage.
This won't of cause wash with the Audiophile magazines that have to tell you otherwise to keep there advertisers happy. It will also not wash with the reps who plug the equipment or the established 'golden eared' so called experts BUT ask the engineers who design this stuff and they will tell you a different story (Unless there involved with promoting the company). Its amazing what your learn when you are allowed into the inner design circle.