I concur, that's probably the closest to its signature.
The 4s have a fun U shape with punchy bass and forward treble. The best I heard for hard-rock and metal (on a warm amp).
The HE-4 - like the HE-6 - have clean and dry sound as opposed to the lush and wet sound of the 500s, 400s and 5LEs (in decreasing order).
here's to hoping the 400i is more clean and dry :3