I haven't seen a thread for modding the Denon AH-D1100 yet, so I feel I have to start one. I have found a way to greatly reduce the bass to normal(ish) levels and bring forward the mids. The steps are below, picture to come.
- Remove ear pads. They are removal method is the same as the removal method for the Sennheiser HD5XX series headphones.
- Locate bass ports. They are at the top. There are two of them and they are hard to miss.
- Cut masking tape in the shape of the bass ports and apply it to them.
- Put ear pads back on.
- Enjoy D1100s with normal(ish) bass levels and halfway forward mids.
Over all, I think the sound is far, far superior after the mod. I showed my friend and he agrees greatly with my conclusion.