I just got a set of second hand DT880s that I bought off of Ebay. The first thing I noticed was that the headband adjusters were very loose. Apart from the up and down movement, there was a significant amount of left and right movement and in-and-out movement. I felt the other end of the adjusters move around inside the headband. I don't have the problem of the cups sliding down without me pulling them down but I read in a review that the adjustment is supposed to be very firm. However, holding the bit of metal that sticks out of the adjusters on the side, they were fine. Is this normal?
Also, I did not get a removable headband in the package. Looking at some reviews after, I only saw that the Pros have the headband. But I was thinking that attaching the clip on headhand would help. They are quite costly.