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Master Engineer: Apple's "Mastered For iTunes" No Better Than AAC-Encoded Music

New submitter Stowie101 writes "British master engineer Ian Shepherd is ripping Apple's Mastered for iTunes service, saying it is pure marketing hype and isn't different than a standard AAC file in iTunes. Shepherd compared three digital music files, including a Red Hot Chili Peppers song downloaded in the Mastered for iTunes format with a CD version of the same song, and said there were no differences. Apple or someone else needs to step it up here and offer some true 'CD quality downloads.'"

14 of 312 comments (clear)

  1. Hey, the pirates can help by Anonymous Coward · · Score: 5, Insightful

    You want CD quality downloads? Yeah, magic keyword "FLAC".

    Piracy: giving you for free what the market won't since the first bestiality video was filmed.

    1. Re:Hey, the pirates can help by Anonymous Coward · · Score: 5, Funny

      FLAC is not inherently CD quality.

      But it generally is, or the ripper is inherently stupid.

    2. Re:Hey, the pirates can help by NatasRevol · · Score: 5, Funny

      Then again...maybe not...the compression wars are killing me. I just got the latest "remastered" edition of the Stones Some Girls album...I have tried twice to listen to it on my home stereo, and it just is painful to the ears.

      That's because you're not using Monster® cables.

      --
      There are two types of people in the world: Those who crave closure
    3. Re:Hey, the pirates can help by ackthpt · · Score: 5, Insightful

      Um, all "Mastered for iTunes" does is allow producers to preview how the final file will sound when placed on iTunes, so that they can make changes to the master file. Not sure what the point of the story is, and it definitely has nothing to do with CDs or FLAC.

      If you are selling it as "Mastered" for a purpose and the quality is identical than it is only "Mastered" for hype and profit.

      I've got some LP singles, which were intended for radio play, back in the day, which are of an improvement over the usually horrible 45 RPM mass productions, possibly better than mass produced LP versions as well. But consider Apple's source is unlikely in most cases to be original mastering materials (who in their right mind would turn over digital originals to Apple?) for them to manipulate for their product (iTunes). Odds are, 95% of their market can't tell anyway because they're hardly audiophiles and are listening through headphones with absurdly limited range and reproduction quality.

      --

      A feeling of having made the same mistake before: Deja Foobar
    4. Re:Hey, the pirates can help by rinoid · · Score: 5, Insightful

      CD quality is not at all high audio quality ... if you ask audiophiles.

    5. Re:Hey, the pirates can help by NatasRevol · · Score: 5, Funny

      It's still obvious you're not using Monster® cables, because not only do they transmit perfect sound, they even remove flaws in badly recorded sound.

      --
      There are two types of people in the world: Those who crave closure
    6. Re:Hey, the pirates can help by gnasher719 · · Score: 5, Informative

      Lets be honest. The only thing you end up losing when going to 16-bit is lost below the noise floor anyway. You use 24 (or better) in the mixing process because that's when it matters.

      Not true. The AAC encoder tries to reproduce its input as faithfully as possible. If you feed it with 16 bit data, that is floating-point data plus quantisation noise, then it tries to reproduce floating-point data plus quantisation noise. Reproducing the quantisation noise is not only pointless (because it is just noise), and takes more bits (because random noise cannot be compressed), or, since the number of bits is fixed, leads to lower quality. If you feed the encoder with floating-point data instead, then it doesn't have to try to encode the noise and has more bits available to encode the actual music.

    7. Re:Hey, the pirates can help by Anonymous Coward · · Score: 5, Insightful

      The claim in the article is that there is "no difference". This claim can be validated quite easily by simply taking the two sources, with normalized amplitude, inverting the phase of one signal and then summing. What remains of the signal is the difference, or the lack thereof, between the two sources. With digital sources, anything other than a null result is considered "coloration" and we are into subjective territory. The questions then begin with "is the color within the potential threshold of human perception?" And if the answer is "yes", then you cannot rely on a single person's opinion to make a determination about the character of the coloration.

  2. hurp by Anonymous Coward · · Score: 5, Informative

    Summary is incorrect. Article says that there was a significant difference between the Mastered for iTunes and CD version, while there was no difference between Mastered for iTunes and a standard AAC track.

  3. Bad summary by tooyoung · · Score: 5, Informative
    The summary implies that the CD version was identical to the Mastered for iTunes version.

    Shepherd compared three digital music files, including a Red Hot Chili Peppers song downloaded in the Mastered for iTunes format with a CD version of the same song, and said there were no differences.

    Here is the actual relevant part of the article:

    After his comparison of the three digital music files, Shepherd says there was a sonic difference between the Mastered for iTunes waveform and the CD waveform. He says the Mastered for iTunes and AAC-encoded files didn't reveal any differences

  4. Re:No difference or no discernible difference? by Anonymous Coward · · Score: 5, Funny

    The problem with computing the digital difference between two files is that sound, and especially music, is an inherently analog experience. All the digital douchery in the world won't change the fact that your ears are not made of robot.

  5. When lossless isn't really lossless by Overzeetop · · Score: 5, Funny

    I know many friends who have used higher compression on their FLAC files and, with my gear, I can clearly hear the artifacts. I realize most people won't but I've got mostly high end stuff, and I always burn in both my audio and network cables before using them and mark them with directional arrows (only with pvc-free tape and audio-grade markers) so that the don't get installed backwards after they've been burned in.

    I'm amazed at how many people can't seem to grasp the fine points of lossless compression for audio work. I find most non-audiophiles expect that lossless means that what you put in exactly matches what you put out. I can tell you first hand, though, that when you spend as much money on gear as I have, you recognize that perfection comes from not just the bits, but the purity in which the bits are delivered. They may be the same ones and zeros, but a discerning ear can always tell the difference in the various lossless formats when listening to the color and soundstage of the reproduced performance.

    --
    Is it just my observation, or are there way too many stupid people in the world?
  6. Duh. by elistan · · Score: 5, Informative
    No surprise. And it's a misunderstanding on the author's part, not a misrepresentation on Apple's part.

    Apple's "Mastered for iTunes" is a set of guidelines about how to turn a master recording into an iTunes-optimized digital file. The author of TFA, however, is talking about taking a CD track and making a compressed version that's as close as possible to the CD track. A CD track is NOT a master file. (We don't want a track that's merely a CD representation - we've heard plenty on /. about how a lot of CD tracks just suck.) "Mastered for iTunes" talks about taking a high-resolution digitial file, like 96/24 or 192/24, and then producing the best possible iTunes Plus file (256 kbps VBR AAC.)

    So of course if you make an iTunes track from a CD track via the "Mastered for iTunes" process, you'll get a 256 kbps VBR AAC that's identical to ripping a CD track to a 256 kbps VBR AAC. However, if you follow Apple's recommendations, quoted here:

    To take best advantage of our latest encoders send us the highest resolution master file possible, appropriate to the medium and the project.
    An ideal master will have 24-bit 96kHz resolution. These files contain more detail from which our encoders can create more accurate encodes. However, any resolution above 16-bit 44.1kHz, including sample rates of 48kHz, 88.2kHz, 96kHz, and 192kHz, will benefit from our encoding process.

    you'll probably get something different, perhaps better, than a CD track ripped to AAC.

    Apple is providing the tools they use to convert to AAC so that sound engineers can preview the product before it goes on sale, but they appear to be the same tools they've been using all along. As I said before, "Mastered for iTunes" isn't a new encoding tool - it's a process workflow. Other recommendations:

    - Apple recommends listening to your masters on the devices your audience will be using
    - Be Aware of Dynamic Range and Clipping
    - Master for Sound Check and Other Volume Controlling Technology
    - Remaster for iTunes [That is, they suggest starting over from the original recordings, rather than send in a file that was mastered with CDs in mind.]

  7. Re:No difference or no discernible difference? by oldlurker · · Score: 5, Interesting

    Total bullshit.

    "Digital douchery" (otherwise known as "analysis") is accurate, where as your ears are imperfect perceptions interpreted by your imperfect brain. If you want to deliver useful information to people, you do it digitally and present the results.

    So take your hipster nonsense and piss off. Any real audiophile would care about what's accurate and useful.

    On of my favourite experiments one of the high-end HiFi magazines did a very long time ago, when CD was new, was to let a group of 'golden ears' audiophiles double blind test CD vs LP. And most of them could reliably distinguish between and prefer LP sound over CD in double blind test (which is good, a lot of people who are hellbent sure they know a difference will fail double blind testing). So far so good. Then they tested with CD-Rs recorded with LP as source.. Now they could no longer tell the difference, and thought the CD-Rs sounded just as good as LP. All that "warm, rich, musical, analogue" sound carried over to the CD-Rs, as they are distortion characteristics of LP playback. It is ok to prefer the sound, but it has nothing to do with CD vs LP or analogue vs digital (and digital is fully capable of reproducing it too if you want).