For example new Iron Maiden album, dynamic range is worst on iTunes, then it's rated higher for CD and highest for 24bit from Onkyo for example. Sometimes they are the same sometimes they are not. My other question would be, if they do use the same masters, has anyone here ever listened to the same song in both "Mastered for iTunes" AND from one of those sellers? If so, did you hear a difference?! (When you answer, please tell us where you got your information from.) Since I downsample my Hi-Res purchases from those other sellers down to 320-400 kbps AAC anyway, I don't believe I'd notice a difference. But what I don't know for sure is are the Hi-Res masters used to make "Mastered for iTunes" releases the EXACT SAME as the ones used by HDTracks/Pono/Acoustic Sounds? Or are they not given the same attention to detail that the other sellers' versions almost always have? If they are, then they really should sound EXACTLY the same as those sellers, but much cheaper. So my question now is, I know that "Mastered for iTunes" uses (or is supposed to use) only masters which are considered Hi-Res, like 24/96.
How do I know this? I tried an ABX test using an Interpol song (PDA) and I could NOT tell a difference, whether in my car or on my Sony MDR-1A headphones. Yes AAC is lossy, but it's still advanced enough at 256 kbps AAC (or higher) to sound exactly the same as Redbook or even Hi-Res. What I DO know is anything from 256 kbps AAC (NOT mp3!) will sound the SAME if it's based off the same master used on say, a 24/96 Hi-Res release. It made me wonder if I'm wasting money purchasing Hi-Res tracks from HDTracks/Pono/Acoustic Sounds.
I've read a lot about Mastered for iTunes.
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