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Originally Posted by Skylab /img/forum/go_quote.gif
This thread, though crazy long and fast pased, and full of lots of hyperbole, was AWESOME, because it showed some folks that 192k AAC is NOT transparent. It may be very close, and it may be good enough for many people in many applications, but it is NOT transparent.
Trose49, you have done a good service to music here. I hope enough people actually wade through this thread to see that if your equipment is at a certain level, then you owe it to yourself to use a good encoder.
So, as I (and many others) have posted many times: RIP CDs in LOSSLESS. Then if you want to use a lossy codec for a portable, transcode to lossy, and use 256k VBR or better, if you have a decently high-resolution rig.
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I almost agree with you. I have long been an advocate of using lossless for archiving and lossy for portable use. The only disagreement that I have is with your statement "192k AAC is NOT transparent." That statement certainly seems to apply to Trose, at least for the one test that he conducted, and perhaps a couple of other people in the thread. But there are others in the thread (myself included) who did the ABX and were unable to successfully distinguish a difference. For us, 192kbps IS transparent, and there is simply no need to use 256k VBR or better. It is just a waste of space with no audible benefit.
To me, the real lesson from this thread is that different people have different sensitivity to encoding artifacts, and that
there is no single answer that will apply to all people. I think that is essentially what you were getting at when you said "it may be good enough for many people in many applications."
My philosophy here on Head-Fi when making recommendations regarding lossy codecs is to recommend that people listen for themselves, preferably in a proper ABX test, and make their own personal decision about what type of encoding best suits their needs. For those who do not want to take the time to do that, I recommend using something like LAME MP3 at the -V2 setting, which averages about 192kbps. I'm always careful to say that
most people find that to be transparent, but even for those who don't, the difference should be small. I still believe that is a valid recommendation.
I would like to hear Trose's thoughts on how big the difference is, to his ears, between the two clips that he tested. The ABX test shows that he can tell a difference. Was it really as big as he claimed in the first post? Or did he find that in a blind test using level-matched files, the difference was much smaller than what he originally claimed?