I just got these in on Friday and the drivers seem to be loose inside the cups. Give it a light shake and both speakers rattle inside the cups and the left side rattles more than the right side so that made me think that it isn't supposed to be like that.
I tried contacting their tech support to find out if they are all made this way on purpose (40 minutes on hold) and their tech said they were just acquired by another company so they had no clue that a Q40 even existed. He suggested that I call their parent company (inMusic) and ask to return them.
The thing is that they sound good to me, and I actually opened up the cups and duct taped the drivers to stop them from rattling. I've seen pictures of others Q40's on here and they didn't seem to have glue or anything on their drivers either to secure them to the cups.
I'm just on the fence now about removing the duct tape and trying to send them back or just keeping them, especially since I just ordered Beyer DT770 pads. I don't really have any experience with other headphones either so I don't have anything to compare this issue against.
tl;dr Does anyone else have experience with loose drivers?