You are probably referring to my Laura
review where I featured XE6 with that cable? Actually, XE6 has been a permanent feature in every single DAP and cable review I publish
The cable pushes uni XE6 sound sig more toward W-shaped, from the original L-shaped as I hear it. To my ears the fit of custom XE6 already brings mids more forward and sound sig closer to W-shaped with stock cable. In pair up with Laura, custom XE6 scales up similar to uni XE6, with improvement in detail retrieval and more clarity in lower mids.