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In The Studio: The Latest On “Mastered For iTunes”
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4) Speaking of the sound quality, iTunes is now using a completely new AAC encoder with a brand new algorithm and the sound quality it produces is stunning. It provides an excellent encode if you use a few common sense guidelines (more on this in a bit), and if you do, the result is almost impossible to hear (at least on the music we listened to).

I mean, there we were, mastering engineers Eddy Schreyer, Gene Grimaldi plus myself, listening in this fantastic listening environment, and we literally couldn’t tell between the source and the encode most of the time.

Now there were some where we could hear the difference too, but it wasn’t that big a difference and certainly didn’t sound anywhere near as bad as the typical MP3.

So what are the tricks to get the best sound quality from an iTunes encode?

It turns out that the considerations are about the same as with MP3 encoding:

  a) Turn it down a bit. A song that’s flat-lined at -.1 dBFS isn’t going to encode as well as something with some headroom. This is because the iTunes AAC encoder outputs a tad hotter than the source, there’s some intersample overs that happen at that level that aren’t detected on a typical peak meter, and all DACs respond differently. Something that won’t be an over on your DAC may be an over on another playback unit. If you back it down to -.5 or even -1 dB, the encode will sound a lot better and your listener probably won’t be able to tell much of a difference anyway.

  b) Don’t squash the master too hard. Masters with some dynamic range encode better. Masters that are squeezed to within an inch of their life don’t. Simple as that. Listeners like it better too.

  c) Although the new encoder has a fantastic frequency response, sometimes rolling off a little of the extreme top end (16k and above) can help the encode as well.

5) “Mastered for iTunes” is only an indication that a hi-res master was supplied; it’s not a separate product. There will always be only one version of the song on iTunes at the same price as before. “Mastered for iTunes” doesn’t mean you get to charge more, or that iTunes charges you more. Everything is like it was before, you just supply a hi-res master so it sounds better.

6) So how do you supply that hi-res master? This is where it gets a bit tricky. If you’re signed to a major label, they’ve been contacted my their Apple reps and everything is in place, so no problem there. If you’re with an indie label, insist that they contact their Apple rep for instructions.

If you use CD Baby or Tunecore, at the moment they’ll tell you they don’t take 24 bit or high sample rate masters. Insist that they contact their Apple rep and don’t take no for an answer (this is what the Apple iTunes guy told us).

Apple is greatly encouraging everyone to get with the program, so the more pressure you put on them, the quicker it will become a standard. Of course, if you can find out who your local Apple rep is (ask the local label), that could expedite things too.

The bottom line is that “Mastered for iTunes” is a great thing for digital music. As far as I can see, there’s no downside to it (except maybe for the initial hassle you may go through as an indie), and you’ll be giving your fans a much better sounding product as a result.

Bobby Owsinski is an author, producer, music industry veteran and technical consultant who has written numerous books covering all aspects of audio recording. For more information be sure to check out his website and blog.


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