QUOTE(caligae @ May 25 2008, 02:40)

QUOTE(bf2008 @ May 24 2008, 22:08)

QUOTE(Soap @ May 24 2008, 11:54)

I could be done double blind by recording the analogue outputs of both the CD player in question and the iPod, level matching the resulting files, and aligning the files so they start at exactly the same point.
The suggestion for your double blind test is good, but then it should be done by professionals, since it involves doing the recording of a signal. I'm afraid that if one of us did it then we would be adding noise in different stages.
We could try a test setup like
this. E.g. compare the output of the CD player/iPod against the original.
For a more number-based evalution, I found some RMAA results of iPods
here.
Hi. Good idea, although I must confess I'm not a big fan of this "scientific" tests, for many reasons, but especially because usually the equipment used is so bad that the results end up being random.
But we could set up an experiment like this: (do you have an ipod and a good dock and a cd player and decent recording equipment, or anyone else here?)
A. Original track in .wav, converted digitally
B. track played by cd player and recorded from the ouputs
C. track played by ipod and recorded from the dock outputs
Then the difference between A and B or C will serve as an indication of how good the recording is, but if we can notice differences, then we won't be able to tell whether it's a problem of both the dock and cd player, or the recording.
But maybe if we're lucky, B and C will sound quite different, but either B or C very close to the original A, in that case we'll be able to say whether the cd player or the dock is better.
But then, maybe it's just much easier if people listen to these sources by their own and share their experiences, which is what I'm encouraging people to do here. I'm not a big fan of these experiments because the idea is to check perception of differences in audio quality. I'm sure there're differences already, and people could use wave analysing programs and not their ears to spot them. How can you be sure people are not doing this instead of actually telling them apart by just using their ears?
I'd prefer if people just tell me their views about the sound quality from the ipod docks compared to their cd players. I'm also going to do this soon, since a friend of mine will lend me his ipod. I'll keep you posted on that!
But anyway, I think I found the answer to my question just from this forums and others I read. I think the ipod will sound very similarly to cd players of the same price range, around £200, like the Cambridge Audio 640C, or many others. But then it will be outperformed by the cd players above, like the CA 740C, etc, since these players start to do upsampling. Hence my conclusion would be to get one of these players if you can afford it (which many also come with digital input), and then wait until Apple releases an ipod with digital out (which should happen soon, given the move to non DRM downloads), or use a laptop with digital out as source (like any Macs, or many other brands), and connect it to the digital input of a cd player.