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OK, I'll try to get some plasticine. . . shove some foam under the pads as well.
You're going to have to go all the way with modding if you want good sound. Here is a fairly basic mod that should sound good:
1. Plasticine (non-drying modelling clay) in the back of the driver baffle. See pictures floating around for help on this.
2. One layer of Paxmate or Silverstone acoustic foam lining the cups. Nice and neat is the key. You need to maximize volume while covering as much surface as possible. You may or may not want to cover the top of that center post in the cups as well.
3. Take 6 regular sized cotton balls, tease them apart, and place them in the cups (6 cotton balls per cup).
4. Remove the felt on the ear-side of the driver baffle. Keep the protective mesh in front of the driver.
5. One layer of acoustic foam on the ear-side of the driver baffle. Don't cover the hole near the driver (or the outer screw holes that holds the cups together). Similarly, make sure you didn't close that hole near the driver inside the cups either with plasticine.
6. Use the 840 earpads. The stock earpads are horrible in both sound and comfort.
This mod keeps the stock felt/paper behind the driver and the stock felt over the open vents in the back of the cups. The vents should be left open, but you can close some of them on the outside with tape if you want to tune them.
If you still don't like how this sounds, you'll need to start doing some more "advanced" or permanent mods suggested by various people. My modded T50RPs easily reach down to around 30Hz and have plenty of bass. I would recommend checking out the latest version of the Rastapants mods with the 840 pads (sometimes called RP2i).