Have the ER4XR. Haven't heard the ER4SR. From memory, the ER4XR is even more transparent than the ER4PT. The way I hear it the XR treble is just perfect. Crystal clear but not detailed to a point to where it would become fatiguing. I've such a hard time imagining how the delicate bass elevation could mask the treble. I really just believe it's a matter of getting used to the overall signature. The way I hear it the treble - all of it - is there for sure.
7/20/16 at 2:34pm