Right so a while back I mentioned that I wasn't too much of a fan of the cover material that's on the inside of the earcup as on one end it was suspended as the inner cup part of the driver is angled much like how Sennheiser ones are meaning there's a gap between the material and the base of the driver itself on one side.
This results in the material vibrating with heavy bass (most noticeable in movies but also some bassy music) and resonating against the top edge of my ears unless I clamp in the ear cups more so the memory foam can get a deeper mould and the material is properly resting on my ear edge.
I decided to cut away this material and noticed a few things.
1: The material is actually quite strong, I couldn't rip it away without fear of ripping the earpad as well. I had to cut away bit by bit along the edge while pinching the material.
2: The material is quite thick when not stretched.
3: I cut out only the left side so I could compare any sound differences when playing music and noticed that now the left side had a slight dominance in high frequencies compared to the right side and in a good way. The difference isn't huge but those of you who notice small differences in sound will notice it I imagine also.
Doing the other side shortly as there's no more resonance against my ear :)
There's no risk of getting dirt inside the driver too because the driver holes themselves are covered by the lighter cover as part of the earcup itself as you can see in the picture below. The surrounding plastic is glued around the earpadding and I can't see any entry into the cup chamber. I guess Philips put the material (that I cut away) there mostly for aesthetic purposes and not for dust protection.