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In Reply to: RE: So what's the deal with CD demagnetizers? posted by geoffkait on November 08, 2015 at 14:55:08
CDs contain digital DATA. As in ones and zeros. Period. The transport's sole job is to read that data. Period. And redbook CDs are designed with lots of error detection and correction--of data.
It's the DAC's job to convert the digital data to analog audio. DAC's are critical; transports are not. Any properly-working transport is as good as any other.
We've all used CDs for data. How many errors do you get? And the error detection and correction on CDs is more robust than that on data CDs. In fact the standard for redbook CDs is that on an otherwise perfect CD you can drill a 4mm hole anywhere and the disk will play perfectly. I've seen that demonstrated.
I think the reason that demagnetized CDs sound better is that the person payed for the demagnetizer.
Seriously, the magic happens--or not--in the DAC. The transport is just a digital data reader.
Follow Ups:
Of course you cannot change the physical data on the CD. No one said you could. The problem is that the laser reading is imperfect, you know, what with all the wobbling and fluttering disc during play, the out of round condition of most CDs, the less than perfect transparency of the clear layer, not to mention the background scattered laser light. You do realize the photodetector is a cheap $1.00 piece of junk, don't you? It's a miracle the CDs play at all. The other thing, it's about the error detection and correction system. It sucks.
Edits: 12/15/15 12/15/15
No errors on my $29 Plexor drive. At least not with properly cared for disks. Just last week a friend gave me a disk in a zip-lock bag, new jewel case. In addition to numerous fingerprints, it looked like it had been used to play Frisbee with a dog. Perhaps I should have demagnetized it before, unsuccessfully, trying to play it.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
"No errors on my $29 Plexor drive."
None that you're aware of, anyway. That's the advantage of experience, one assumes. You realize how many errors there a actually are, even for $15K players and DACs. But if you're happy, I'm happy.
If I can do an EAC/dbpoweramp AccurateRip-verified rip at 100% confidence, that's good enough for me. That means my drive has to be making the *exact* same errors as the millions of other people who have ripped the same disc.
Jim J.
Millions? Depends on your taste in music. Some of the stuff I rip my rip is the only version in the database. Much of it, it's less than a dozen.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
If you're happy that's what counts.
Happy New Year
Problem isn't experience, it's knowledge and hard work. Not to be confused with excellence in scam artistry.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Edits: 12/19/15
You are a funny fellow inasmuch as you onviously believe you know something.
Having tested hundreds of rips against databases, I have excellent empirical evidence that a $29 'puter drive can get a 100% accurate read of a CD. It's a pretty robust technology.
I do however get excellent results from hanging chicken feet over my server.
That's what everybody says.
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