Because most CD buyers don't care.
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As far as I know, there are no true 24 bit A/D converters. So 24 bit resolution is more of a marketing ploy than a reality. Also, any recent releases by reputable companies have been remastered at high bit/sample rate resolution. And even if they don't use HDCD, and most don't, current remasters use advanced dithering algorithms. Some remasters will sound better than others, but it has nothing to do with whether it's 24 bits or not.
As Wino said, CCR's first six albums, remastered, were reissued today. I don't know how they sound or how they compare to the box set that was released a few years ago. Has anyone been able to compare them?
I think the next high-res digital format will be 24/96 downloads, or something like that. There are some available now at Music Giants. I don't know when a large scale rollout will happen. It could be months, It could be years.
I recently purchased CCR's Bayou Country on SACD and the most striking thing about it was....the tape hiss!!! It was the worst I have ever heard. Was the original LP this bad? I am thinking of getting their other titles but not if they have this hiss. I am 32 so my only exposure to CCR before this was what I heard in movies and on the radio (which is quite a lot).
I would have thought they would have done something to eliminate that amount of hiss.
"Why do the record companies not smply remaster all of these older recordings to either 24 bit or HDCD?"
Celtic66 is spot on. The vast majority of the music-buying public are after quick internet or store downloads of compressed files to their mp3 disc/ipod/cell phone to play at ear-bleeding volumes.
There's simply not nearly enough CD buyers out there who would buy remastered discs to justify their time and expense. Changing the CD format to 24bit/96kHz is something that should have been done a decade ago to help prolong CD's, but the market couldn't even embrace 20-bit HDCD.
Yes Kijanki, technically correct.
(From Wikipedia: "HDCD encodes the equivalent of 20 bits worth of data in a 16-bit digital audio signal by utilizing custom dithering, audio filters, and some reversible amplitude and gain encoding."
My point was that the market ignored a very good, backward compatible improvement on standard CD's (HDCD) back when CD's were still being sold in high numbers. The proliferation of digital compressed music in the mass market will eventually spell the end of redbook CD's, let alone any high-res discs.
Carl109 - I have bad suspicion that the only thing that drives them to create new standard is desire to implement copy protection and raise pricing. SACD has pit modulation technique where watermark of CD is implemented by modulating sizes of each pit. It can be read only by specific device and therefore cannot be copied. What they failed to do is to lower price first to sway people into new standard but instead they put prices over $30 on CD that cost the same to manufacture as regular CD. They shot themselves in the foot but we all are suffering.
In my opinion they will never release 24bit/192kHz recordings since it would deliver perfect master tapes to all countries where copying for sale is done at large scale. I remember even record I had once that was made in Cuba. Russian government was copying for years records from all over the world since they did not sign international agreement. Formats released are always "equivalent" to 20 bits and not more. SACD is equivalent to 20-bits as well even though they store master tapes in wide DSD that contain at least 4x information.
I have never heard master tapes nor I have equipment to appreciate them but I read posts of people who did and they say sound is out of this world.
It is all very sad that bureaucrats and marketers control progress of an audio but I would even settle for SACD if I could afford $30 CDs.
Both HDCD and SACD contain not more than 4000 titles each but HDCD wasn't as expensive as SACD and the sound was decent (never heard one).
Absolute Phase is when you reverse the hook ups at the source..cd player's outputs and at the other end of the interconnect you (do not) reverse the cable hook ups...you do the same thing to your speaker cables too...amp you reverse the hook ups and at your speaker hook ups you do not reverse the cables....For (some systems) this is one of the best things you can do to it to make it sound better!.........
Hifisoundguy - thanks for the link. Te problem is practical side of it. Even if there is noticable improvement with reverse phase on both speakers changing the phase is not an easy task. Since records, according to article, have 50% chance of being in given phase, it would require to examine every record and storing this info somewhere. I don't want to touch my interconnects and reversing speaker leads every time is not a practical proposition espessialy with spades. If I don't do anything I got 50% chance of success - ain't bad.