As I have reviewed both with loaded samples (so I don't talk myself after spending money) I quite disagree with the above and in my opinion the technical advantages of the IE900 over the IE600 are clearly audible and distinguishable.
And by reviewed I mean that I had the chance to live with both for more than a month and not heard them for a couple of hours at the best.
Of course it would be naive for someone to expect double the better performance because he paid double the price.
We are in the high end realm, you pay a lot to get less than you expect but this quantity makes the difference.
Of my first priority in order to choose would be the sound signature.
And by reviewed I mean that I had the chance to live with both for more than a month and not heard them for a couple of hours at the best.
Of course it would be naive for someone to expect double the better performance because he paid double the price.
We are in the high end realm, you pay a lot to get less than you expect but this quantity makes the difference.
Of my first priority in order to choose would be the sound signature.
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