XEO: some mid and high frequencies are disappearing or weak.

My Xeo (2, 10, 20, 30) speakers seem to work fine, but some frequencies are very weak while the bass remains normal.

This FAQ is valid for: Xeo 2, Xeo 10, Xeo 20, Xeo 30

Make sure that you have not assigned both speaker to the same channel. Left or right.

Assigning one to Left and the other one to right should solve the issue.