Originally Posted by nick_charles /img/forum/go_quote.gif
Not to start a big war here, but I'm afraid I just don't agree with your opinion. DACs make a tremendous difference. They are your analog source. The DAC chip is completely measurable. But you're forgetting the A in DAC. There is an analog stage here, built with electronic components that can vary tremendously in quality, price, and sound quality. Two DACs built around the same chipset can have very different sounds.
The analog stages of a DAC are all completely measurable as well, the output has its own FR, noise and distortion products and a well-implemented DAC will have negligible deviations from the input signal, if it is high fidelity that is, of course it is eminently possible to alter the output sound but then it is no longer high fidelity by definition. The digital and analog technology used in a DAC is a **really** mature technology now and far from expensive, there is no reason a $200 DAC built to a competent design cannot produce high fidelity output (audibly) indistinguishable from a similarly well-implemented $1000 DAC and in fact tests elsewhere have shown this to be true on numerous occiasions.
Would you make the same argument for a cd player? A cd player is nothing more than a digital transport and a DAC in one unit. A digital transport certainly should be completely measurable, so the only thing remaining is the DAC side of the cd player. You're saying that cd players should all be indistinguishable?
Level matched most CD players are indistinguisghable under controlled conditions, the give-away is the output level, a 0.5db difference is almost always detected as a difference in quality, but this is an illusion. I tested my own CD players from different eras and with very different topologies, the difference in level was always detected but level matched to about 0.1db they were all the same. Ditto my external DAC which is far (measurably) superior to the in-built-DACs on all my CD players but is also extremely hot, again adjusting for level differences....