Dude do you speak English as your second language? Sorry, not to be insulting but what you said is very hard to make any sense of. Are you asking which of the 2 IEMs you listed are better suited for both Jazz and Alternative Rock? All I know is the EX1000s have a larger sound stage are overall more refined, and are more romantic. The 7550 is not as refined, has more emphasis on mids and less emphasis on treble compared to the EX1000. So in the end it just depends on what you are looking for in a sound signature. The EX1000s weren't to my liking but I'm glad they found a new home, just as the FX700s found a new home with me ;).
sorry.English is not good.ex1000 for various types of rock and jazz, it is more appropriate?