cafe zeenuts has been experimenting with the best combination of Grado Jumbo pads ("bagels") with his HF-2s to bring out the soundstage, and materials to cover the driver with to reduce the resulting sibilance. I'm definitely going to try this myself and try a few local materials as well to see how things go.
http://img200.imageshack.us/img200/969/chuxy.jpg
http://img200.imageshack.us/img200/969/chuxy.jpg
