Απάντηση: Re: Ενα Dac...
Όσο για τις "άχρηστες" μετρήσεις RMAA, αν εννοείς αυτές τελικά, τους δίνω ακριβώς την αξία που τους δίνουν και κάτι άσχετοι Ρώσοι των IXT LABS! (Ούτε πάνω ούτε κάτω!):
"There's no sense in comparing quality of products exclusively by measurements, because the distortions are too slight (1/10000 fractions of percent). But still you can notice some interesting facts at a sensible approach.
The largest amplitudes of the 2nd and 3rd harmonics are exactly the converter distortions. Opamp harmonics are considerably smaller. In the sound community there's an exaggerated theory that opamps, not converters, have a radical impact on sound.
Then, graphs indicate that distortions significantly reduce according to reduction of amplitude. Considering that we obtained the sum of input and output measurements, the nonlinearity is even less essential. There's a big question whether ear is able to notice distortions of source if they are three orders lower than distortions of the following path/
What does gives us the right to consider harmonics spectrum of test signal? Perhaps, as long as we can hear the difference between devices with the same feature distinctions, we can use distortion measurements as an indirect factor of quality estimation. At that, measurement tools and methods should be and are to be improved, of course.
Another important benefit and these measurements is their objectivity and repeatability. The former is indicated by independence of test results from tester. The latter, as well as the checkability, allows to uncover overstated specifications and objectively control possible device defects or path issues. The disadvantage is that measurements and correct interpretation of results require rather high level of proficiency.
It's a pity, but certain magazines use RMAA with incorrect device settings and publish unexplainable results that no one is able to comment. Measurements are just a tool that puts all the responsibility for test results usage and interpretation on the person who conducts tests and uses results afterwards.
The RMAA marks - "Bad", "Good", "Excellent" - are just rough interval estimates for amateurs. It's not to be considered by sound experts."
Eλπίζω να βοήθησα...
Όσο για τις "άχρηστες" μετρήσεις RMAA, αν εννοείς αυτές τελικά, τους δίνω ακριβώς την αξία που τους δίνουν και κάτι άσχετοι Ρώσοι των IXT LABS! (Ούτε πάνω ούτε κάτω!):
"There's no sense in comparing quality of products exclusively by measurements, because the distortions are too slight (1/10000 fractions of percent). But still you can notice some interesting facts at a sensible approach.
The largest amplitudes of the 2nd and 3rd harmonics are exactly the converter distortions. Opamp harmonics are considerably smaller. In the sound community there's an exaggerated theory that opamps, not converters, have a radical impact on sound.
Then, graphs indicate that distortions significantly reduce according to reduction of amplitude. Considering that we obtained the sum of input and output measurements, the nonlinearity is even less essential. There's a big question whether ear is able to notice distortions of source if they are three orders lower than distortions of the following path/
What does gives us the right to consider harmonics spectrum of test signal? Perhaps, as long as we can hear the difference between devices with the same feature distinctions, we can use distortion measurements as an indirect factor of quality estimation. At that, measurement tools and methods should be and are to be improved, of course.
Another important benefit and these measurements is their objectivity and repeatability. The former is indicated by independence of test results from tester. The latter, as well as the checkability, allows to uncover overstated specifications and objectively control possible device defects or path issues. The disadvantage is that measurements and correct interpretation of results require rather high level of proficiency.
It's a pity, but certain magazines use RMAA with incorrect device settings and publish unexplainable results that no one is able to comment. Measurements are just a tool that puts all the responsibility for test results usage and interpretation on the person who conducts tests and uses results afterwards.
The RMAA marks - "Bad", "Good", "Excellent" - are just rough interval estimates for amateurs. It's not to be considered by sound experts."
Eλπίζω να βοήθησα...
fftopic:
