Yes, its the bumps on the bottom of the headband, I don't even notice them at first but after about a half hour or so it starts to get a bit sore...then REALLY sore.
Okay, a kinda funny/sad story, those headphones were making the top of my head sore while I'm listening to the radio and hear a commercial for the Serta iComfort Sleep System. They say if you go to their website and ask for the info pack info they'll send you a sample of their new Gel Memory Foam (light bulb goes on, I have an idea).
So, I have the brilliant idea of getting a sample and then cutting it into a small piece that I can use between the my head and the K701 headband. For some reason they sent me two boxes of their gel foam along with a DVD...haven't tried cutting up the foam yet...its rather thick (about 2") and I can't imagine how stupid I'd look with the foam sitting atop my head but under the headband but I bet it would be comfortable.
If I can get my hands on about 30 more of those gel foam samples I could glue them together to make a great topper for my bed.
Someone on here replaced the K701 headband recently with another headband from AKG and it looked sharp! I'll have to look for their post and pics.