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In Reply to: RE: I have never measured a CD that has peaks beyond 0db.....but posted by Ric Schultz on January 31, 2017 at 14:10:15
I'm not sure how you are measuring the CDs, you would have to oversample it to see the "real" peaks, some ripping software will tell you if there are "overs". That is what inter-sample peak means, the samples on the CD are not the actual peak values except at low frequencies. At high frequencies, the sample point can be quite a ways off from the peak. The digital and analog reconstruction filters will of course restore the peaks if they have the headroom, though the problem is seldom with the analog section. For best sounding results, CD mastering engineers should set the peak level using an oversample filter to pick up the real peaks, but they often don't.
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Favorite album of recent times, beautiful and completely mesmerizing: The Revolutionary Army of the Infant Jesus - Beauty Will Save the World
Edits: 01/31/17Follow Ups:
They are not the same. Yes, some highly compressed music (why would you listen to it anyway?) could indeed do what is said. However, does that mean it is really that audible and to whom and when? Did they show an example of a clipped signal? Did they tell you at what point on a certain musical cut it happens and then what happens when listening....when it does? Do you have to go to the hospital after hearing all the distortion from all the "other" DACs that don't do what theirs does? The quote below is from their article:"Most converters clip whenever an inter-sample over occurs. The DAC2 will not clip these overs. This is probably the single most important improvement in D/A technology in the past 10 years! This difference explains 90 to 100 % of the audible differences between the DAC1 and the DAC2. It also sets the DAC2 apart from almost all other D/A converters."
Wow! what a statement. So the fact that they changed DACs and everything else they hype really does practically nothing to the sound? Only this "new invention" that they thought of and are the only ones doing it...is meaningful? Forget output stages, damping, tweaking, etc. Only this thing is meaningful?.....You have got to be kidding!?!
I was just now listening to a just finished modded Gustard and the magic was not there. On purpose, I had not put two pieces of damping material on caps on both sides of the output board because I run the damping material over to the chassis struts and I wanted to be able to remove the board quickly to try a different low jitter clock. Well, I put back on those two pieces of damping material and practically started crying the sound was now so good. Oh, I am sorry, I lied....really I changed the digital filter settings internally so it won't clip anymore and that is why it now sounds so good....after all, this tweak is the most important improvement in DAC technology in the last 10 years.
And before I put that damping material back on I also put a small piece of damping material on the top of the clock and it made a significant audible improvement......well, I lied again...nothing happened as the only thing that makes a real improvement is to lower the digital gain by 3.5db.
They really do know how to write a tale! Commercial nerdistic ad copy at its best....he he. I like my subjective audio rantings better....at least they are what I experience with my ears and my soul. I believe (BE plus LIVE) what I say.
Yes, digital clipping could be audible on certain cuts. How audible and to whom is clearly not why the article was written. They are feeling the heat of competition. The more words you write that make your product sound invincible could result in keeping your sales high. There are DACs coming out every day and some are so good (and relatively inexpensive) they make you cry (modded Gustard Pro, for instance).
Edits: 01/31/17 01/31/17 01/31/17
I didn't read the article or have any interest in their DACs, and agree there are much more important design considerations than how a digital filter handles intersample peaks above 0dB, but in lieu of an industry standard that forces CDs to be mastered correctly, it would be nice if digital filters did handle at least mild overs, which many do.
Good luck with your Gustard mods. Looks like a nice package.
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Favorite album of recent times, beautiful and completely mesmerizing: The Revolutionary Army of the Infant Jesus - Beauty Will Save the World
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