High Sensitvity = good transient response ?

I know everyone hates this kind of response, but, it depends on the speaker. Most would say that electrostatics and some other planar and ribbon speakers have excellent transient response, but they generally have pretty low sensitivity in the mid to low 80db area. There are also some subwoofers that have efficiency of over 93db that are slow as molasses. Regardless of efficiency levels, the transient response game is usually won by lightweight radiation surfaces with short movement, and high power magnetic driving mechanisms. Sometimes this relates to high sensitivity speakers, but not always.

As usual, an excellent response Twl.

Could you be referring to dynamic range as opposed to transient response? If that's the case, higher sensitivity speakers generally appear to sound more dynamic --or have greater dynamic range/swing than lower senstivity models.