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In Reply to: RE: The problem is the obsolete CD format, not digital. posted by John Elison on September 06, 2015 at 08:48:02
DAC reviews usually measure the output spectra in the audio band. This is how these devices are typically measured and reviewed, but this does not mean they don't have RF output. If you would like me to agree, I would agree with you that almost all consumer digital audio products are improperly designed. That's the way it is, and in many cases they are improperly designed because the designers don't really know what they are doing. (With rare exceptions, there isn't enough money in high end audio to attract the necessary talent which is working on telecommunications and military systems where there is more money to be made.)
I suggest you look at some of Miksa's measurements of DAC spectra into the RF region. You will see that many, if not most, DACs are not properly designed. In the linked page post #806 is most relevant.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Follow Ups:
At the 2015 CES I had a long talk with the chief engineer from Prism Audio. To demonstrate jitter they had one of there own excellent dacs and a poorly designed dac they put together. I asked him how do you design a bad dac and he said it was really easy. It is done all the time. Being a gentleman he wouldn't name any dacs
Alan
> I suggest you look at some of Miksa's measurements of DAC spectra into the RF region.
I suggest you buy a TASCAM DA-3000 DSD Recorder and make a digital copy of a vinyl record, but I doubt that will ever happen.
Good luck,
John Elison
Tony- You make yet another set of good informed obserations. Makes a lot if sense that the braintrust is not in the consumer audio little niche industry. I am very suspicious of the arguments for DAC types ( NOS vs oversampling, vs up sampling) I suspect there are bigger and more fundamental issues at stake, from analogue stage quality, to power supplies. Let's face it; a good spiel and a fancy faceplate is a fairly reliable way to make some money around these here parts. And then there is the OCD accuracy myopia that sacrifices musicality for measurements and the majority of the industry is somewhere between theses poles.
Anyway, are there any specific key design specs that you have found to be significant or indicative of the engineering quality?
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