I discovered that the superluxes have a little bit of something that appears to be a plastic molded piece resulting from the manufacturing process. (see on the picture)

This small piece of plastic simply doesnt exist on beyerdinamic models like the DT990.

The problem of this piece of plastic is that it limit the system’s articulation when it touch the pads. This give the pads a bad angle on the ears.
I removed this with a knife and a pliers and the improvement in confort is very nice.
The placement of the pads on the ears and the sealing are improved giving a better balance R/L.