Matt
He-he.
Glad to hear you're diggin your Stax.
scrypt, tweetertinelle
As I've said, I'm not a sound engineer and won't pretend to be. I'm not even an audiophile. I'm just a consumer with a bit of an obsession at the moment--so think of me as the same guy who buys Sony V600s only with a bit more research thanks to HeadFi and HeadWize.
So here's my amateurish observation and theory on it:
When I hear a similar sound in each (every) recording on a certain component that I do not hear on any other component, I usually will call that sound a coloration or signature. The idea there is that something is being added to the sound in addition to the original recording. No component I have heard is completely free of this. Some people like these colorations because they feel (whether they say so or not) that this coloration is adding something the recordings and other equipment *should* have had, but didn't. Which way does it sound "more realistic"? Which way does it sound "better"?
When I talk about the W100 virtues, in this case the signature is a big distraction for me. It's prevailing compared to its other characteristics. Remember, this is not to say the HD600 is free of coloration--only to say that its signature is less distracting from the music to me. When I ask those questions, to me, the coloration does NOT make the recordings more realistic and does NOT make the recordings better. I fully expect some people to disagree with me in the same way that many people prefer "warm" cables and "tubie" amplifiers.
I've tried to imagine what the W100 might be like without this coloration. Here, I feel the headphone is mediocre--average. Some will probably like its frequency response curve--it's not flat, but it's flaws are in different spots from the HD600. Some will think it is of a low resolution and transient speed like the HD600 (I have to disagree with Matt and say that it is not as quick and resolving as the Etymotic or Stax). One would probably also notice that it's a little too polite on the higher frequencies--causing a somewhat homogenous sound in the uppoermost frequencies that tames some of the harshness from bad sources and bad recordings--many people would like this aspect of the headphone.
It's really too bad that the W100 is so diffuclt to audition. I realize that my tastes are not a one size fits all and that many of you who have heard lots of other headphones still love the W100. I can ultimately only represent my own opinion however, and my warnings are intended more for the new user trying to decide on his first major headphone purchase, not at insulting those of you who already own the W100. To them, I can only offer this: The W100 can be had for about $330+shipping from Japan. The HD600 can be had for $220 with shipping included from Germany. And for my taste, I like the HD600 a hell of a lot better.