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Originally Posted by HeadphoneAddict /img/forum/go_quote.gif
Most of the time, yes. It certainly helps to do a direct comparison, and most of the time I insist on that, but occasionally that isn't possible.
I can over-focus on certain details and aspects of what I hear (bass, mids, treble, transparency, decay, coloration, soundstage), and I commit that to memory in terms that I will remember later when I need to. So, when I listen to the same piece of music later I can say to myself, "This doesn't sound like what I filed away last time I heard it."
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I know what you mean, but from all the snake-oil type stuff on Head-fi and Speaker-fi communities, I would much rather place doubt on my aural memory. Music sounds different depending on so many variables that it's difficult to recall the quality of music you heard even a day before. Not only does the sound of music depend on your mood, but it also depends on how long you've been listening, your energy, the time of day, what you ate, whether you have allergies, the exact volume, how much you spent, etc.. For example, a simple difference in volume can lead to ideas such as "oh, the bass has more impact".
To decrease the number of variables, the only way is to have both amps at hand, and even in that case, it is difficult to make definite conclusions. I would only make a conclusion if I can identify repeatable differences that occur that varying volumes.
I bring this up because the D1 and D2 are designed by the same company. The amps are likely to be somewhat similar in signature, and I would doubt anyone who says that their D2 sounds better than the D1 they don't have anymore.
I don't want to get into the discussion of cables, but the scientific tests and anecdotal evidence do not coincide. This leads me to doubt other aspects of sound comparison.