Uh, i'm still fairly new around here, and must admit that i have yet to get a grasp on many of the expressions, with "dynamics being one of those i haven't really figured out (english is not my native language, and this complicates everything a bit).
Oh, another question about the se215: Usually, how often should the olive tips be replaced? I read that they are much more durable than the yellow tips, but i haven't found any precise info about it.
Well, the Shure Olives do last a lot longer than Comply foam tips. I've heard that they can easily last four to six months for many folks. However, it can vary widely. The biggest variables are: how rough you are with them, how much earwax you produce (ew), and how acidic your earwax is (EWWWWW, Lol).
Okay, so, "dynamics": They're basically about how "hard hitting" stuff sounds. Think of something like a hard drum-kick. Does it have a really sharp edge to the start of the sound, and a really sharp fade-out when the sound is over, the way it should? Does it sound nice and punchy, with good impact that really punches into your skull? Or say someone is playing a really fast guitar-solo. . .do all the notes have really sharp definition, no matter how fast it gets? That's dynamics. It is most related to what we call "transient response" in terms of the actual mathematical measurements of how headphones and other equipment operate, although there are a few other factors that go into it as well. Dynamics also refers to shifts in volume, and how accurately wide shifts in volume are conveyed both in terms of the volume itself, and the speed of the response.
In the end, you could say Dynamics are very similar/related to Attack, although they are not quite the same thing. In fact, what I should have said before, instead of just "good dynamics," would be good
dynamics/attack, because the way the SE215 performs well, to my ear, is a combo of hte two. In fact I'd say they do better with the attack than with the dynamics.
These should be a good point fo reference for you:
http://www.head-fi.org/t/220770/describing-sound-a-glossary
http://www.head-fi.org/a/glossary-of-terms
http://www.head-fi.org/t/563656/audiophile-terms-for-dummies
That's just for getting started with, though
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