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In Reply to: RE: There's a strong possibility that it won't move past sighted listening. posted by Tony Lauck on December 16, 2014 at 18:15:42
Once #1 is proven, files did not have different checksums, then the point is that it didn't matter whether a switching power supply or linear power supply was used on the CD/DVD drive used to rip the files. Both files are as identical as can be.
Taking it further, even if two different CD/DVD drives were used to rip, and both files checkout identical (AccurateRip / MD5 checksum), then one drive didn't produce a better ripped file than the other.
#2 - #6 are possibilities but not what the OP is trying to determine as best I can tell.
Follow Ups:
Sorry, the two rip files may have the same MD5 checksum and the same bits stored in them, but they will not be identical. They will have different metadata. They will have different file names and will be stored on different disk sectors. Therefore, the logical axiom of equality is not applicable. Reasoning should be as simple as possible, but not too simple. In this case, your reasoning is too simple.
You can trust me: if I ever get two files that are bit identical that I can hear sound different, I will get to the bottom of the situation, no matter if it is the last thing I do. Every case that I've seen so far has always ended up in one of three ways: (1) the files were not bit identical, (2) the files sounded the same to me on my system, or (3) the files sounded different to me on my system until I found and fixed a problem with my system. For example, I found that two files that had the same bits in them did sound different. Indeed, they sounded different even when playing with the volume control turned all the way down. This was because one file was fragmented and the other was not and it was possible to hear clicks from the disk seeks. The cure was to copy both files to RAM disk and play out of there.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Two ripped files with the same MD5 checksums are identical.... otherwise their checksums would not match. It IS really that simple.
And remember, we're talking only about ripping a file from a CD/DVD drive, not how or where it is stored on the computer's disk or RAM or how it is played back. All of that is 'downstream' and does not matter in the context of what I believe the OP is trying to determine. Only the files themselves are in question for this particular test.
Any differences in sound cannot be attributed to the files if both rips produce the same MD5 checksum.
If you use a linear power supply on the CD/DVD drive or a switching power supply on the same CD/DVD drive, and both rips produce files with identical MD5 checksums, then it did not matter which power was used.
If a difference is heard, it is not due to the files themselves.... It must be downstream.
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