[thetheory]

I've always enjoyed my sound. But I have never really looked into it. I currently own a pair of Shure SE210's, and am looking into some new, higher quality ones. Before I make a decision, I want to do my research, and find what I'm getting myself into. 
 
What are in IEM's?
What is best in IEM's? Dynamic, or balanced armature? 
 
And lastly, what is a great IEM? Reading reviews on amazon gets a bit grating. There is too much personal opinion in the overall construct of each. I understand each person has a different type of sound they like, but I'm just looking for the simple facts.
 

 

 
 

 

[phosphorique]

If you ask me, a great iem is one that you enjoy listening to the most!

 

[ClieOS]

If you want to learn about the basic knowledge of IEM, read the guide in my sig.
 
As for which is best - There is no simple fact. what is 'best'? How do you define 'best' when everyone has his/her own classification and opinion? If there is an undisputed best, then we won't need to be in Head-fi. Like phosphorique said, a great IEM is one that makes you enjoy your music. It is the process of finding such IEM to fit the personal preference that's often the most difficult.

 

[thetheory]

What are your thoughts as to the sennheiser IE7's?