both are great speakers and different design approaches, however i believe the jbl 4430 is more coherent, more dynamic, better transient response and has better impact on the high and mid freq. now on the other hand, the 250ti's have more detail and the bass is more "in your chest" where the bass in the 4430 is more "in your gut"! overall my vote is with the jbl 4430 as i believe it has a more "live" factor then the 250ti. as a general rule, i compare speakers not to one another but to "live" events.