I did these really quick. 90db SPL/A white noise.
Sony makes their own BA drivers in the XBA3??? They do sound
different from other types of BA drivers (Knowles and the other company - I forget the name.) Distortion is high, but interesting to note that distortion characteristics is very different from other BA types, which tend have odd order (D3+D5) distortion relatively higher. Summary: Overall a magnitude higher distortion, but distortion characteristics more similar to that of traditional dynamic drivers). Does the XBA3 really use BA drivers???
ER-4S for example (note the scales on the Y axis!